Bump Microsoft.NET.Test.Sdk from 16.11.0 to 17.3.1 in /UnitTests#21

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mastergrbell-ms/Microsoft.IO.RecyclableMemoryStream:masterfrom

dependabot/nuget/UnitTests/Microsoft.NET.Test.Sdk-17.3.1grbell-ms/Microsoft.IO.RecyclableMemoryStream:dependabot/nuget/UnitTests/Microsoft.NET.Test.Sdk-17.3.1Copy head branch name to clipboard