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 96.49%. Comparing base (eeb58f1) to head (c77ce35).
Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1195   +/-   ##
=========================================
  Coverage     96.49%   96.49%           
  Complexity      196      196           
=========================================
  Files            32       32           
  Lines           828      828           
=========================================
  Hits            799      799           
  Misses           29       29           

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