feat: Symfony 7 support

[kbond]

Adjusted the CI test matrix to add PHP 8.3 and only supported Symfony versions.

[kbond]

Ak, sorry @mbabker, I didn't see #75

[loic425]

@kbond Could we hope you merge it soon?
I'd like to start working on Symfony 7 support for Sylius packages and I need this support too.

[Chris53897]

I am not sure which persons have the right to merge or make a new release.
That is a question for @matthiasnoback

[kbond]

Friendly ping @stloyd, @xabbuh, @Nyholm. This PR and SymfonyTest/SymfonyDependencyInjectionTest#149 are blocking a bunch of bundles from being upgraded to support Symfony 7.

[loic425]

Another small and friendly ping to @stloyd, @xabbuh, @Nyholm.
RC1 is released and we all have a lot of work to do for Symfony 7 support :)
Thx a lot for all your work.

[Nyholm]

Thank you

[Nyholm]

Can someone verify this on their project before we do a release?

[loic425]

Can someone verify this on their project before we do a release?

Hum I think we all use it via matthiasnoback/symfony-dependency-injection-test.
So I think we need this one to test it => SymfonyTest/SymfonyDependencyInjectionTest#149

[Nyholm]

Let's sneak this out then so CI pass on SymfonyTest/SymfonyDependencyInjectionTest#149

[Nyholm]

A bunch more PRs have been merged on https://github.com/SymfonyTest/SymfonyDependencyInjectionTest

We've dropped sf 4.4 and php 7.

Please test it out.