Add php8.1 test

[mako321]

No description provided.

[codecov]

Codecov Report

Merging #9 (9ac9cdf) into main (cc6cabf) will not change coverage.
The diff coverage is n/a.

@@            Coverage Diff            @@
##               main       #9   +/-   ##
=========================================
  Coverage     78.94%   78.94%           
  Complexity       56       56           
=========================================
  Files            17       17           
  Lines           152      152           
=========================================
  Hits            120      120           
  Misses           32       32           

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