Fix warning CA1062#CachePolicy

[Zombach]

Pull Request

The issue or feature being addressed

#2215

Details on the issue fix or feature implementation

• Suppress CA1062 in src/Polly/Caching/CachePolicy.cs or fix the warning

Confirm the following

• I started this PR by branching from the head of the default branch
• I have targeted the PR to merge into the default branch
• I have included unit tests for the issue/feature

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.01%. Comparing base (72331dc) to head (849123a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2238      +/-   ##
==========================================
+ Coverage   84.00%   84.01%   +0.01%     
==========================================
  Files         313      313              
  Lines        7227     7234       +7     
  Branches     1078     1081       +3     
==========================================
+ Hits         6071     6078       +7     
  Misses        785      785              
  Partials      371      371              

Flag	Coverage Δ
linux	84.01% <100.00%> (+0.01%)	⬆️
macos	84.01% <100.00%> (+0.01%)	⬆️
windows	84.01% <100.00%> (+0.01%)	⬆️

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