chore (ci): add CI for PHP 8.5 on 2.2 branch

[phil-davis]

No description provided.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.90%. Comparing base (81723a6) to head (b698cb9).
⚠️ Report is 3 commits behind head on 2.2.

Additional details and impacted files

@@             Coverage Diff              @@
##                2.2     #311      +/-   ##
============================================
- Coverage     97.08%   96.90%   -0.19%     
  Complexity      125      125              
============================================
  Files            13       13              
  Lines           515      484      -31     
============================================
- Hits            500      469      -31     
  Misses           15       15              

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