Enhancement: Run tests on PHP 8.1

[localheinz]

This pull request

• runs tests on PHP 8.1

[codecov]

Codecov Report

Merging #524 (4dfab67) into main (bcb0330) will not change coverage.
The diff coverage is n/a.

@@             Coverage Diff             @@
##                main      #524   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        87        87           
===========================================
  Files             12        12           
  Lines            302       302           
===========================================
  Hits             302       302           

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