chore (ci): add CI for PHP 8.5 on v3 branch

[phil-davis]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.88%. Comparing base (fc8d15a) to head (c248de1).
⚠️ Report is 3 commits behind head on v3.

Additional details and impacted files

@@             Coverage Diff              @@
##                 v3     #310      +/-   ##
============================================
- Coverage     96.94%   96.88%   -0.06%     
  Complexity      117      117              
============================================
  Files            13       13              
  Lines           491      482       -9     
============================================
- Hits            476      467       -9     
  Misses           15       15              

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