Bump Microsoft.AspNetCore.Mvc.Testing from 5.0.8 to 5.0.9 in /src (#734)

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 5.0.8 to 5.0.9.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Commits](https://github.com/dotnet/aspnetcore/commits)

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

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src/SampleWeb.Tests/SampleWeb.Tests.csproj

@@ -4,7 +4,7 @@
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="GraphQL" Version="4.5.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.8" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.9" />
     <PackageReference Include="Xunit" Version="2.4.1" />
     <PackageReference Include="Verify.Xunit" Version="11.23.0" />
     <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />