Bump Microsoft.Extensions.Http.Polly from 6.0.8 to 6.0.9 in /src (#1237)

Bumps [Microsoft.Extensions.Http.Polly](https://github.com/dotnet/aspnetcore) from 6.0.8 to 6.0.9.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v6.0.8...v6.0.9)

---
updated-dependencies:
- dependency-name: Microsoft.Extensions.Http.Polly
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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src/AzureIoTHub.Portal/Server/AzureIoTHub.Portal.Server.csproj

@@ -41,7 +41,7 @@
     <PackageReference Include="Microsoft.CodeAnalysis.Analyzers" Version="3.3.3" />
     <PackageReference Include="Microsoft.CodeAnalysis.NetAnalyzers" Version="6.0.0" />
     <PackageReference Include="Microsoft.EntityFrameworkCore.Design" Version="6.0.8" />
-    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="6.0.8" />
+    <PackageReference Include="Microsoft.Extensions.Http.Polly" Version="6.0.9" />
     <PackageReference Include="Microsoft.Graph" Version="4.39.0" />
     <PackageReference Include="Microsoft.OpenApi" Version="1.4.2" />
     <PackageReference Include="Microsoft.VisualStudio.Azure.Containers.Tools.Targets" Version="1.17.0" />