Bump Microsoft.AspNetCore.Mvc.Testing from 7.0.18 to 7.0.20#453

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dependabot/nuget/tests/Experiment.Tests/Microsoft.AspNetCore.Mvc.Testing-7.0.20michaelvolz/OpenGraphTilemaker:dependabot/nuget/tests/Experiment.Tests/Microsoft.AspNetCore.Mvc.Testing-7.0.20Copy head branch name to clipboard