ci: add php85

[jorgsowa]

Adds PHP 8.5 to CI pipeline.

Prerequisites:

• chore: symfony 8 dependencies #770

[oojacoboo]

@jorgsowa if you'll pull the merged changes, to get the fix from #770, that should get all the tests passing here.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.81%. Comparing base (53f9d49) to head (d3a43b0).
⚠️ Report is 126 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master     #771      +/-   ##
============================================
- Coverage     95.72%   94.81%   -0.92%     
- Complexity     1773     1847      +74     
============================================
  Files           154      175      +21     
  Lines          4586     4879     +293     
============================================
+ Hits           4390     4626     +236     
- Misses          196      253      +57     

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