PHP 8.5

[didoda]

This introduces php 8.5 in php github workflow.

This also adds psalm.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (7f4bcc7) to head (198fb7f).
⚠️ Report is 3 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##              master       #47   +/-   ##
===========================================
  Coverage     100.00%   100.00%           
  Complexity        28        28           
===========================================
  Files              5         5           
  Lines            146       146           
===========================================
  Hits             146       146           

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