Fix warning CA1062#DefaultCacheKeyStrategy

[Zombach]

Pull Request

The issue or feature being addressed

#2215

Details on the issue fix or feature implementation

• Suppress CA1062 in src/Polly/Caching/DefaultCacheKeyStrategy.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 83.93%. Comparing base (c75b43b) to head (4fa02d4).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2218      +/-   ##
==========================================
+ Coverage   83.90%   83.93%   +0.03%     
==========================================
  Files         313      313              
  Lines        7181     7183       +2     
  Branches     1061     1062       +1     
==========================================
+ Hits         6025     6029       +4     
+ Misses        785      784       -1     
+ Partials      371      370       -1     

Flag	Coverage Δ
linux	83.90% <100.00%> (+<0.01%)	⬆️
macos	83.93% <100.00%> (+0.03%)	⬆️
windows	83.90% <100.00%> (+<0.01%)	⬆️

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