Issue with PHP 8.3 and v5.10

[northhill]

@Gaetan I have created an upgrade guide if that is of any assistance to you.

How to upgrade to PHP8.3 and upgrade to InvoiceNinja 5.10.x

Hello community. Recently there have been many people having problems with upgrading their self-hosted version of InvoiceNinja to the most recent 5.10.x version as well as upgrading PHP to 8.2 or 8.3. I have put together an upgrade guide to try provide some assistance here. Base Assumptions: You have command line access and a user with sudo rights I have tested this with Ubuntu 22.04. It should work with Debian as well. It is not recommended to upgrade to php8.3 on versions of Ubuntu older t…