Bump Microsoft.AspNetCore.Mvc.Testing from 9.0.2 to 9.0.3 in /src

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 9.0.2 to 9.0.3.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Changelog](https://github.com/dotnet/aspnetcore/blob/main/docs/ReleasePlanning.md)
- [Commits](dotnet/aspnetcore@v9.0.2...v9.0.3)

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

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

Author: dependabot[bot]

src/Directory.Packages.props

@@ -13,7 +13,7 @@
     <PackageVersion Include="GraphQL.SystemTextJson" Version="8.4.1" />
     <PackageVersion Include="MarkdownSnippets.MsBuild" Version="27.0.2" />
     <PackageVersion Include="Microsoft.AspNetCore.Http" Version="2.3.0" />
-    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.2" />
+    <PackageVersion Include="Microsoft.AspNetCore.Mvc.Testing" Version="9.0.3" />
     <PackageVersion Include="Microsoft.Data.SqlClient" Version="6.0.1" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore" Version="9.0.2" />
     <PackageVersion Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.2" />