Fix warning CA1062#AsyncRateLimitPolicy

[Zombach]

Pull Request

The issue or feature being addressed

#2215

Details on the issue fix or feature implementation

• Suppress CA1062 in src/Polly/RateLimit/AsyncRateLimitPolicy.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 83.97%. Comparing base (4e05ea1) to head (15cfcb1).
Report is 3 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2223      +/-   ##
==========================================
+ Coverage   83.92%   83.97%   +0.05%     
==========================================
  Files         313      313              
  Lines        7191     7215      +24     
  Branches     1066     1072       +6     
==========================================
+ Hits         6035     6059      +24     
  Misses        785      785              
  Partials      371      371              

Flag	Coverage Δ
linux	83.97% <100.00%> (+0.05%)	⬆️
macos	83.97% <100.00%> (+0.05%)	⬆️
windows	?

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