Bump Polly from 8.6.5 to 8.6.6 (#234)

Updated [Polly](https://github.com/App-vNext/Polly) from 8.6.5 to 8.6.6.

<details>
<summary>Release notes</summary>

_Sourced from [Polly's
releases](https://github.com/App-vNext/Polly/releases)._

## 8.6.6

## Highlights

* Fix `ScheduledTaskExecutor` deadlock when `TrySetResult` runs
continuations inline by @​crnhrv in
App-vNext/Polly#2953

## What's Changed

* Add specification tests for jitter by @​martincostello in
App-vNext/Polly#2830
* Refactor property-based tests by @​martincostello in
App-vNext/Polly#2831
* .NET 10 preparation by @​martincostello in
App-vNext/Polly#2842
* Fix CS7035 warning in dependabot jobs by @​martincostello in
App-vNext/Polly#2849
* Remove codecov/test-results-action by @​martincostello in
App-vNext/Polly#2872
* Update to .NET 10 SDK by @​martincostello in
App-vNext/Polly#2531
* Bump zizmor to v1.19.0 by @​martincostello in
App-vNext/Polly#2882
* Fix typo by @​martincostello in
App-vNext/Polly#2886
* Add RateLimitHeaders library to community resources by @​alexis- in
App-vNext/Polly#2887
* Bump zizmor to 1.21.0 by @​martincostello in
App-vNext/Polly#2905
* .NET 11 preparation by @​martincostello in
App-vNext/Polly#2932
* Remove Stryker workaround by @​martincostello in
App-vNext/Polly#2933
* Group .NET dependency updates by @​martincostello in
App-vNext/Polly#2944
* Migrate to actions/attest by @​martincostello in
App-vNext/Polly#2952

## New Contributors

* @​alexis- made their first contribution in
App-vNext/Polly#2887
* @​crnhrv made their first contribution in
App-vNext/Polly#2953

**Full Changelog**:
App-vNext/Polly@8.6.5...8.6.6


Commits viewable in [compare
view](App-vNext/Polly@8.6.5...8.6.6).
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Directory.Packages.props

@@ -9,7 +9,7 @@
     <PackageVersion Include="LibGit2Sharp" Version="0.31.0" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="18.3.0" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="10.0.103" />
-    <PackageVersion Include="Polly" Version="8.6.5" />
+    <PackageVersion Include="Polly" Version="8.6.6" />
 	<PackageVersion Include="System.CommandLine" Version="2.0.3" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />