Bump Microsoft.AspNetCore.Mvc.Testing from 6.0.28 to 6.0.30

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 6.0.28 to 6.0.30.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v6.0.28...v6.0.30)

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

Signed-off-by: dependabot[bot] <support@github.com>

src/SignalR/Akka.Streams.SignalR.Tests/Akka.Streams.SignalR.Tests.csproj

@@ -13,7 +13,7 @@
         <PackageReference Include="xunit.runner.visualstudio" Version="$(XunitRunnerVersion)" />
         <PackageReference Include="coverlet.collector" Version="6.0.2" />
         <PackageReference Include="Microsoft.AspNetCore.SignalR.Client" Version="8.0.4" />
-        <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.28"/>
+        <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.30"/>
     </ItemGroup>
 
     <ItemGroup>