Enhancement: Add support for PHP 8.4

[localheinz]

This pull request

• adds support for PHP 8.4

Follows ergebnis/php-package-template#1610.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 99.31%. Comparing base (3f21cae) to head (77f54cd).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main     #893   +/-   ##
=========================================
  Coverage     99.31%   99.31%           
  Complexity       68       68           
=========================================
  Files            16       16           
  Lines           291      291           
=========================================
  Hits            289      289           
  Misses            2        2           

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