Bump Microsoft.AspNetCore.TestHost from 9.0.0 to 9.0.1 in /src

Bumps [Microsoft.AspNetCore.TestHost](https://github.com/dotnet/aspnetcore) from 9.0.0 to 9.0.1.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v9.0.0...v9.0.1)

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

Signed-off-by: dependabot[bot] <[email protected]>

src/Directory.Packages.props

@@ -6,7 +6,7 @@
   <ItemGroup>
     <PackageVersion Include="Magick.NET-Q16-AnyCPU" Version="14.4.0" />
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
-    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="9.0.0" />
+    <PackageVersion Include="Microsoft.AspNetCore.TestHost" Version="9.0.1" />
     <PackageVersion Include="Microsoft.NET.Test.Sdk" Version="17.12.0" />
     <PackageVersion Include="Microsoft.Playwright" Version="1.49.0" />
     <PackageVersion Include="NUnit3TestAdapter" Version="4.6.0" />