Do not attempt to __reduce__ when hashing classes in cache

[philippjfr]

Fixes #7478

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.38%. Comparing base (ce938bf) to head (bc4fa82).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7484      +/-   ##
==========================================
- Coverage   82.38%   82.38%   -0.01%     
==========================================
  Files         339      339              
  Lines       50980    50986       +6     
==========================================
+ Hits        42000    42004       +4     
- Misses       8980     8982       +2     

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