Refactor: keep only a limited number of cache key mutexes

[emmercm]

No description provided.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.24%. Comparing base (c114188) to head (6ddda8b).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1237      +/-   ##
==========================================
+ Coverage   93.22%   93.24%   +0.01%     
==========================================
  Files         108      108              
  Lines        6705     6716      +11     
  Branches     1589     1477     -112     
==========================================
+ Hits         6251     6262      +11     
  Misses        453      453              
  Partials        1        1              

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[github-actions]

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