Add PHP 8.4 to test matrix

[ruudk]

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.75%. Comparing base (103f306) to head (3148f21). Report is 2 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1377   +/-   ##
=========================================
  Coverage     82.75%   82.75%           
  Complexity       60       60           
=========================================
  Files             4        4           
  Lines           377      377           
=========================================
  Hits            312      312           
  Misses           65       65           

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[ruudk]

@localheinz Could you please approve the workflow?

[localheinz]

Thank you, @ruudk!