Fix warning CA1062#AsyncTimeoutPolicy

[Zombach]

Pull Request

The issue or feature being addressed

#2215

Details on the issue fix or feature implementation

• Suppress CA1062 in src/Polly/Timeout/AsyncTimeoutPolicy.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 83.99%. Comparing base (c07cc48) to head (b17fba8).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2228   +/-   ##
=======================================
  Coverage   83.98%   83.99%           
=======================================
  Files         313      313           
  Lines        7219     7223    +4     
  Branches     1074     1076    +2     
=======================================
+ Hits         6063     6067    +4     
  Misses        785      785           
  Partials      371      371           

Flag	Coverage Δ
linux	83.99% <100.00%> (+<0.01%)	⬆️
macos	83.99% <100.00%> (+<0.01%)	⬆️

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