NuGet(deps): Bump Microsoft.AspNetCore.Mvc.Testing from 6.0.3 to 6.0.4

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 6.0.3 to 6.0.4.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v6.0.3...v6.0.4)

---
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>

Author: dependabot[bot]

tests/PowerUtils.AspNetCore.ErrorHandler.Tests/PowerUtils.AspNetCore.ErrorHandler.Tests.csproj

@@ -23,7 +23,7 @@
     <PackageReference Include="Moq" Version="4.17.2" />
     <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.1.0" />
     <PackageReference Include="FluentAssertions" Version="6.6.0" />
-    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.3" />
+    <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.4" />
     <PackageReference Include="PowerUtils.Text" Version="2.1.0" />
     <PackageReference Include="PowerUtils.xUnit.Extensions" Version="2.2.0" />
     <PackageReference Include="xunit" Version="2.4.1" />