deps: Bump Microsoft.NET.Test.Sdk from 17.14.1 to 18.6.0#4

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dependabot/nuget/tests/OpenMppt.Tests/Microsoft.NET.Test.Sdk-18.6.0MarkS0485/OpenMPPT:dependabot/nuget/tests/OpenMppt.Tests/Microsoft.NET.Test.Sdk-18.6.0Copy head branch name to clipboard