Bump Microsoft.AspNetCore.Mvc.Testing from 9.0.15 to 9.0.21 - #11

Bump Microsoft.AspNetCore.Mvc.Testing from 9.0.15 to 9.0.21#11

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dependabot/nuget/backend/IntegrationTests/Microsoft.AspNetCore.Mvc.Testing-9.0.21Karol8284/BatchBridge:dependabot/nuget/backend/IntegrationTests/Microsoft.AspNetCore.Mvc.Testing-9.0.21Copy head branch name to clipboard