Test with Symfony 7.1 and leverage its features

[norkunas]

Pull Request

Related issue

Fixes #<issue_number>

What does this PR do?

• Adds Symfony 7.1 to CI;
• Uses ramsey/composer-install gh action to install dependencies;
• Uses new DateTimeNormalizer::CAST_KEY when available to serialize datetimes as timestamps;

PR checklist

Please check if your PR fulfills the following requirements:

• Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
• Have you read the contributing guidelines?
• Have you made sure that the title is accurate and descriptive of the changes?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 86.99%. Comparing base (7e7cbc6) to head (021fb25).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #334      +/-   ##
============================================
+ Coverage     86.91%   86.99%   +0.07%     
  Complexity        1        1              
============================================
  Files            19       19              
  Lines           818      823       +5     
============================================
+ Hits            711      716       +5     
  Misses          107      107              

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[norkunas]

Side effect from #322 was that removing .* from sf-version, it uses directly the defined version instead of highest, so for 5.4 it uses 5.4.0 instead of 5.4.40

[norkunas]

bors merge

[curquiza]

bors merge

[curquiza]

bors merge-

[curquiza]

bors merge

[curquiza]

Issue with bors again, merging by hand