Bump Microsoft.AspNetCore.Mvc.Testing from 3.1.10 to 5.0.0

Bumps [Microsoft.AspNetCore.Mvc.Testing](https://github.com/dotnet/aspnetcore) from 3.1.10 to 5.0.0.
- [Release notes](https://github.com/dotnet/aspnetcore/releases)
- [Commits](dotnet/aspnetcore@v3.1.10...v5.0.0)

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

Author: dependabot-preview[bot]

webBeta.NSerializer.AspNetCore.Test/webBeta.NSerializer.AspNetCore.Test.csproj

@@ -7,7 +7,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="3.1.10" />
+        <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="5.0.0" />
         <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.8.3" />
         <PackageReference Include="xunit" Version="2.4.1" />
         <PackageReference Include="xunit.runner.visualstudio" Version="2.4.3" />