Add a CI job running on PHP 8.5

[stof]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.56%. Comparing base (4897dc4) to head (164021a).
⚠️ Report is 4 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #879   +/-   ##
=========================================
  Coverage     98.56%   98.56%           
- Complexity      349      389   +40     
=========================================
  Files            24       24           
  Lines           909      909           
=========================================
  Hits            896      896           
  Misses           13       13           

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