Bump MSTest from 3.9.2 to 4.2.3#244

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dependabot/nuget/Solutions/Corvus.Monitoring.ApplicationInsights.Specs/multi-7e3eb686eccorvus-dotnet/Corvus.Monitoring:dependabot/nuget/Solutions/Corvus.Monitoring.ApplicationInsights.Specs/multi-7e3eb686ecCopy head branch name to clipboard