chore: add ci tests for php 8.3

[Chris53897]

No description provided.

[garak]

"Dev deps" should test against php 8.3 as well

[Chris53897]

@garak You want this to be changed to 8.3 (see new commit) or additional "Dev deps" tests to 8.2?

[garak]

Hello @Chris53897
it seems you need to find a PHPUnit configuration compatible with both 9.6 and 10.0 PHPUnit versions.

[Chris53897]

I am not sure if this is possible.

Possible solutions
a) two seperate xml-files
b) stick with phpunit 9
c) Just ignore/silence the deprecation warning (preferred by me)
...

I suggest that the error should be fixed upfront. I am not sure if it is already fixed.

[garak]

Let's go with the solution you prefer.
Anytime soon we'll drop support for PHP 8.0 (which will be EOL before the end of the year), so we'll be able to require PHPUnit 10 only and remove the workaround.

[Chris53897]

Sorry for late response. I forgot about this PR