V4 update php broken (assumed)

Hi,
I’m working on updating 4.4.4 to 4.5.19 in preparation for updating to V5. I’ve tried the update script, but after update the web page is blank white, so I assume it’s a php error. I’m on PHP 7.1.33, at least CLI, on CentOS with NGINX. I’ve followed the instructions at https://invoice-ninja.readthedocs.io/en/latest/update.html . I did clear cache too.

Here is the output of my composer and php commands:

[root@invoiceninja ninja]# composer dump-autoload --optimize
Generating optimized autoload files
Warning: Ambiguous class resolution, "ZendService\Google\Exception\InvalidArgumentException" was found in both "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/ZendService/Google/Exception/InvalidArgumentException.php" and "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/Exception/InvalidArgumentException.php", the first will be used.
Warning: Ambiguous class resolution, "ZendService\Google\Exception\RuntimeException" was found in both "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/ZendService/Google/Exception/RuntimeException.php" and "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/Exception/RuntimeException.php", the first will be used.
Warning: Ambiguous class resolution, "ZendService\Google\Gcm\Client" was found in both "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/ZendService/Google/Gcm/Client.php" and "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/Gcm/Client.php", the first will be used.
Warning: Ambiguous class resolution, "ZendService\Google\Gcm\Message" was found in both "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/ZendService/Google/Gcm/Message.php" and "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/Gcm/Message.php", the first will be used.
Warning: Ambiguous class resolution, "ZendService\Google\Gcm\Response" was found in both "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/ZendService/Google/Gcm/Response.php" and "/var/www/ninja/vendor/zendframework/zendservice-google-gcm/library/Gcm/Response.php", the first will be used.
Warning: Ambiguous class resolution, "Websight\GcsProvider\CloudStorageServiceProvider" was found in both "/var/www/ninja/vendor/websight/l5-google-cloud-storage/src/Websight/GcsProvider/CloudStorageServiceProvider.php" and "/var/www/ninja/vendor/websight/l5-google-cloud-storage/src/CloudStorageServiceProvider.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\SourceContext" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/SourceContext.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/SourceContext.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\Type" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/Type.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/Type.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\GPBEmpty" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/GPBEmpty.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/GPBEmpty.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\Any" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/Any.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/Any.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\Struct" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/Struct.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/Struct.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\FieldMask" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/FieldMask.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/FieldMask.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\Duration" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/Duration.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/Duration.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\Timestamp" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/Timestamp.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/Timestamp.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\Wrappers" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/Wrappers.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/Wrappers.php", the first will be used.
Warning: Ambiguous class resolution, "GPBMetadata\Google\Protobuf\Api" was found in both "/var/www/ninja/vendor/google/protobuf/src/GPBMetadata/Google/Protobuf/Api.php" and "/var/www/ninja/vendor/google/gax/metadata/Protobuf/Api.php", the first will be used.
Carbon 1 is deprecated, see how to migrate to Carbon 2.
https://carbon.nesbot.com/docs/#api-carbon-2
    You can run './vendor/bin/upgrade-carbon' to get help in updating carbon and other frameworks and libraries that depend on it.
> Illuminate\Foundation\ComposerScripts::postAutoloadDump
> @php artisan package:discover
Discovered Package: anahkiasen/former
Discovered Package: barryvdh/laravel-cors
Discovered Package: barryvdh/laravel-debugbar
Discovered Package: barryvdh/laravel-ide-helper
Discovered Package: intervention/image
Discovered Package: jaybizzle/laravel-crawler-detect
Discovered Package: laravel/socialite
Discovered Package: laravel/tinker
Discovered Package: laravelcollective/html
Discovered Package: maatwebsite/excel
Discovered Package: nesbot/carbon
Discovered Package: nwidart/laravel-modules
Discovered Package: pragmarx/google2fa-laravel
Discovered Package: webpatser/laravel-countries
Package manifest generated successfully.
[root@invoiceninja ninja]# php artisan optimize --force
[root@invoiceninja ninja]# php artisan migrate
**************************************
*     Application In Production!     *
**************************************

 Do you really wish to run this command? (yes/no) [no]:
 > yes

Migrating: 2018_05_14_091806_limit_notifications
Migrated:  2018_05_14_091806_limit_notifications
Migrating: 2018_05_19_095124_add_json_permissions
Migrated:  2018_05_19_095124_add_json_permissions
Migrating: 2018_06_29_110607_add_dart_format_column
Migrated:  2018_06_29_110607_add_dart_format_column
Migrating: 2018_07_26_170243_fix_payment_contact_foreign_key
Migrated:  2018_07_26_170243_fix_payment_contact_foreign_key
Migrating: 2018_10_22_084326_add_option_for_product_notes
Migrated:  2018_10_22_084326_add_option_for_product_notes
Migrating: 2019_08_27_074711_add_app_store_order_id
Migrated:  2019_08_27_074711_add_app_store_order_id
[root@invoiceninja ninja]# php artisan db:seed --class=UpdateSeeder
**************************************
*     Application In Production!     *
**************************************

 Do you really wish to run this command? (yes/no) [no]:
 > yes

Running UpdateSeeder...
Seeding: CountriesSeeder
Seeding: PaymentLibrariesSeeder
Seeding: FontsSeeder
Seeding: GatewayTypesSeeder
Seeding: BanksSeeder
Seeding: InvoiceStatusSeeder
Seeding: PaymentStatusSeeder
Seeding: CurrenciesSeeder
Seeding: DateFormatsSeeder
Seeding: InvoiceDesignsSeeder
Seeding: ProposalTemplatesSeeder
Seeding: PaymentTermsSeeder
Seeding: PaymentTypesSeeder
Seeding: LanguageSeeder
Seeding: IndustrySeeder
Seeding: FrequencySeeder
Seeding: DbServerSeeder

If I recall correctly, they started requiring PHP 7.2 or newer with the 4.5 branch.

Are there any errors in the web sever error log?