Run unit tests against PHP 8.5

[mukeshpanchal27]

Summary

Fixes #2274

Relevant technical choices

Use of AI Tools

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 68.86%. Comparing base (f7846e4) to head (d9e1a15).
⚠️ Report is 10 commits behind head on trunk.

Additional details and impacted files

@@           Coverage Diff           @@
##            trunk    #2227   +/-   ##
=======================================
  Coverage   68.86%   68.86%           
=======================================
  Files          90       90           
  Lines        7610     7610           
=======================================
  Hits         5241     5241           
  Misses       2369     2369           

Flag	Coverage Δ
multisite	68.86% <ø> (ø)
single	35.47% <ø> (ø)

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[mukeshpanchal27]

Composer package issue for 8.5 - docker-library/wordpress#986

[github-actions]

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Co-authored-by: westonruter <westonruter@git.wordpress.org>
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