Fix warning CA1062#AsyncBulkheadPolicy

[Zombach]

Pull Request

The issue or feature being addressed

#2215

Details on the issue fix or feature implementation

• Suppress CA1062 in src/Polly/Bulkhead/AsyncBulkheadPolicy.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 84.04%. Comparing base (72331dc) to head (23f0e81).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2237      +/-   ##
==========================================
+ Coverage   84.00%   84.04%   +0.03%     
==========================================
  Files         313      313              
  Lines        7227     7245      +18     
  Branches     1078     1080       +2     
==========================================
+ Hits         6071     6089      +18     
  Misses        785      785              
  Partials      371      371              

Flag	Coverage Δ
linux	84.04% <100.00%> (+0.03%)	⬆️
macos	84.04% <100.00%> (+0.03%)	⬆️
windows	84.04% <100.00%> (+0.03%)	⬆️

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