Bump Microsoft.NET.Test.Sdk from 17.11.1 to 18.7.0#11

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mastercarbarher/LanCopy:masterfrom

dependabot/nuget/tests/LanCopy.Tests/Microsoft.NET.Test.Sdk-18.7.0carbarher/LanCopy:dependabot/nuget/tests/LanCopy.Tests/Microsoft.NET.Test.Sdk-18.7.0Copy head branch name to clipboard