Bump Microsoft.NET.Test.Sdk from 17.9.0 to 18.6.0#15

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dependabot/nuget/tests/Files.InteractionTests/Microsoft.NET.Test.Sdk-18.6.0danielepalo/Files-main:dependabot/nuget/tests/Files.InteractionTests/Microsoft.NET.Test.Sdk-18.6.0Copy head branch name to clipboard