chore (ci): add CI for PHP 8.5 on v2 branch

[phil-davis]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.64%. Comparing base (f8de521) to head (f8c79ca).
⚠️ Report is 3 commits behind head on v2.

Additional details and impacted files

@@            Coverage Diff             @@
##               v2     #129      +/-   ##
==========================================
- Coverage   97.67%   97.64%   -0.03%     
==========================================
  Files           1        1              
  Lines         172      170       -2     
==========================================
- Hits          168      166       -2     
  Misses          4        4              

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