Bump Polly from 8.6.3 to 8.6.4 (#204)

Updated [Polly](https://github.com/App-vNext/Polly) from 8.6.3 to 8.6.4.

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

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

## 8.6.4

## What's Changed

* Fix after-release and update CHANGELOG by @​martincostello in
App-vNext/Polly#2714
* Use collection expressions by @​martincostello in
App-vNext/Polly#2715
* Fix flaky mutants by @​martincostello in
App-vNext/Polly#2717
* fix documentation for ExecuteOutcomeAsync by @​carvex21 in
App-vNext/Polly#2710
* Bump MartinCostello.WaitForNuGetPackage by @​martincostello in
App-vNext/Polly#2721
* Bump sign tool by @​martincostello in
App-vNext/Polly#2722
* xunit v3 preparation by @​martincostello in
App-vNext/Polly#2723
* Add summary NuGet badges by @​martincostello in
App-vNext/Polly#2724
* Delete actionlint config by @​martincostello in
App-vNext/Polly#2730
* RateLimiting: add typed builder/guard tests and external limiter
lifetime test by @​mohammed-saalim in
App-vNext/Polly#2711
* Update Dependabot auto-merge conditions by @​martincostello in
App-vNext/Polly#2736
* Bump NuGet packages by @​martincostello in
App-vNext/Polly#2738
* Bump dotnet-stryker to 4.8.1 by @​martincostello in
App-vNext/Polly#2739
* Simplify code by @​martincostello in
App-vNext/Polly#2740
* Update zizmor by @​martincostello in
App-vNext/Polly#2746
* Use NuGet Trusted Publishing by @​martincostello in
App-vNext/Polly#2751
* Respect override for PipelineExecuting and PipelineExecuted by
@​peter-csala in App-vNext/Polly#2752

## New Contributors

* @​carvex21 made their first contribution in
App-vNext/Polly#2710
* @​mohammed-saalim made their first contribution in
App-vNext/Polly#2711

**Full Changelog**:
App-vNext/Polly@8.6.3...8.6.4


Commits viewable in [compare
view](App-vNext/Polly@8.6.3...8.6.4).
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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="17.14.1" />
     <PackageVersion Include="Microsoft.SourceLink.GitHub" Version="8.0.0" />
-    <PackageVersion Include="Polly" Version="8.6.3" />
+    <PackageVersion Include="Polly" Version="8.6.4" />
 	<PackageVersion Include="System.CommandLine" Version="2.0.0-rc.1.25451.107" />
     <PackageVersion Include="xunit" Version="2.9.3" />
     <PackageVersion Include="xunit.runner.visualstudio" Version="3.1.5" />