Fix DelayAsync extension

[martintmk]

Details on the issue fix or feature implementation

Follow-up of #1522 (also fixes the build)

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
• I have successfully run a local build

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: -0.10% ⚠️

Comparison is base (daf1529) 84.11% compared to head (f121912) 84.02%.
Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1525      +/-   ##
==========================================
- Coverage   84.11%   84.02%   -0.10%     
==========================================
  Files         278      278              
  Lines        6586     6546      -40     
  Branches     1026     1024       -2     
==========================================
- Hits         5540     5500      -40     
  Misses        837      837              
  Partials      209      209              

Flag	Coverage Δ
linux	?
macos	84.02% <100.00%> (-0.10%)	⬇️
windows	84.02% <100.00%> (-0.10%)	⬇️

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Files Changed	Coverage Δ
...rcuitBreakerResiliencePipelineBuilderExtensions.cs	100.00% <ø> (ø)
...Core/CircuitBreaker/CircuitBreakerStateProvider.cs	100.00% <ø> (ø)
...ack/FallbackResiliencePipelineBuilderExtensions.cs	100.00% <ø> (ø)
...ly.Core/Hedging/HedgingActionGeneratorArguments.cs	100.00% <ø> (ø)
src/Polly.Core/Hedging/HedgingConstants.cs	100.00% <ø> (ø)
src/Polly.Core/Outcome.TResult.cs	100.00% <ø> (ø)
src/Polly.Core/Outcome.cs	100.00% <ø> (ø)
src/Polly.Core/ResilienceProperties.cs	100.00% <ø> (ø)
src/Polly.Core/Retry/RetryConstants.cs	100.00% <ø> (ø)
...c/Polly.Core/Retry/RetryDelayGeneratorArguments.cs	100.00% <ø> (ø)
... and 16 more

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