Bump Microsoft.AspNetCore.Mvc.Testing from 6.0.2 to 6.0.3

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 6.0.2 to 6.0.3.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v6.0.2...v6.0.3)

---
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>

Directory.Packages.props

@@ -52,7 +52,7 @@
     <PackageVersion Include="MediatR" Version="10.0.1" />
     <PackageVersion Include="MediatR.Extensions.Microsoft.DependencyInjection" Version="10.0.1" />
     <PackageVersion Include="Microsoft.AspNetCore.Mvc.NewtonsoftJson" Version="6.0.3" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.2" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="6.0.3" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.Web" Version="6.0.2" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.WebAssembly" Version="6.0.3" />
     <PackageVersion Include="Microsoft.AspNetCore.Components.WebAssembly.DevServer" Version="6.0.2" />