Bump Microsoft.AspNetCore.TestHost from 8.0.5 to 8.0.6 in /src (#164)

Bumps [Microsoft.AspNetCore.TestHost](https://github.com/dotnet/aspnetcore) from 8.0.5 to 8.0.6.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](https://github.com/dotnet/aspnetcore/compare/v8.0.5...v8.0.6)

---
updated-dependencies:
- dependency-name: Microsoft.AspNetCore.TestHost
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

src/Directory.Packages.props

@@ -6,7 +6,7 @@
   <ItemGroup>
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="8.0.5" />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.5" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="8.0.6" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.10.0" />
     <PackageVersion Include="ProjectDefaults" Version="1.0.127" />
     <PackageVersion Include="Verify" Version="24.2.0" />