Fix warning CA1062#AsyncCacheTResultSyntax

[Zombach]

Pull Request

The issue or feature being addressed

#2215

Details on the issue fix or feature implementation

• Suppress CA1062 in src/Polly/Caching/AsyncCacheTResultSyntax.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

Attention: Patch coverage is 27.27273% with 48 lines in your changes missing coverage. Please review.

Project coverage is 83.55%. Comparing base (72331dc) to head (4828fbc).

Files	Patch %	Lines
src/Polly/Caching/AsyncCacheTResultSyntax.cs	27.27%	39 Missing and 9 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2243      +/-   ##
==========================================
- Coverage   84.00%   83.55%   -0.45%     
==========================================
  Files         313      313              
  Lines        7227     7286      +59     
  Branches     1078     1088      +10     
==========================================
+ Hits         6071     6088      +17     
- Misses        785      818      +33     
- Partials      371      380       +9     

Flag	Coverage Δ
linux	83.55% <27.27%> (-0.45%)	⬇️
macos	83.55% <27.27%> (-0.45%)	⬇️
windows	83.55% <27.27%> (-0.45%)	⬇️

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