Add compatibility for PHP 8.4

[christian-kolb]

Changes

• Added new docker image.
• Changes make commands to use 8.4.
• Updated composer requirements.

Todo

• Wait for Psalm compatibility with 8.4
• Upgrade components as soon as they are compatible.

Resolves #69

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (ee4b93a) to head (61bb7f1).
Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff             @@
##                main       #70   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity       134       134           
===========================================
  Files              6         6           
  Lines            277       277           
===========================================
  Hits             277       277           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[christian-kolb]

Will be handled in different PR