Allow Symfony 6

[fbourigault]

This allows Symfony 6 components.

This is a draft ATM because I only ran some tests locally.

CI failure seems unrelated. See https://github.com/composer/composer/issues/10387.

[codecov-commenter]

Codecov Report

Merging #1815 (d602d8e) into master (d9817c1) will not change coverage. The diff coverage is 100.00%.

@@            Coverage Diff            @@
##             master    #1815   +/-   ##
=========================================
  Coverage     87.83%   87.83%           
  Complexity     7836     7836           
=========================================
  Files           281      281           
  Lines         22748    22748           
=========================================
  Hits          19981    19981           
  Misses         2767     2767           

Flag	Coverage Δ
5-max	87.83% <100.00%> (ø)
7.4	87.83% <100.00%> (ø)
agnostic	68.54% <0.00%> (ø)
mysql	70.53% <100.00%> (ø)
pgsql	70.42% <100.00%> (ø)
sqlite	68.46% <100.00%> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...pel/Generator/Command/Console/Input/ArrayInput.php	44.28% <100.00%> (ø)

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[fbourigault]

Now psalm job is fixed, I get 11 errors related to added return types in Symfony 6.

I checked those errors and are all enforcing the 5.x behavior.

Should I add those errors to the baseline to keep the current behavior?

[dereuromark]

I guess so. They are not functionally relevant, are they?

In a next step we need to get rid of at least v3 here. That might also simplify a few things.

[dereuromark]

Lets focus on getting this merged first, so we can easier then finalize also the v3 removal PR.

[fbourigault]

I did some cleanup in tests/composer:

• I removed composer-php8.json as it seems unused.
• I fixed php version requirement.
• I removed php 7.3 polyfill.
• I bumped PHPUnit requirement to 9.5+.