Bump testing versions to PHP 8.4 & Symfony 7.3

[yann-eugone]

Bump testing versions

• PHP 8.3 => 8.4
• Symfony 7.0 => 7.3

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.73%. Comparing base (4b2a727) to head (0364568).
Report is 1 commits behind head on 0.x.

Additional details and impacted files

@@            Coverage Diff            @@
##                0.x     #177   +/-   ##
=========================================
  Coverage     99.73%   99.73%           
  Complexity      929      929           
=========================================
  Files           155      155           
  Lines          2999     2999           
=========================================
  Hits           2991     2991           
  Misses            8        8           

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