deps: Bump Microsoft.NET.Test.Sdk from 18.5.1 to 18.8.1#14

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dependabot/nuget/tests/EQ2Lexicon.ACTPlugin.Tests/Microsoft.NET.Test.Sdk-18.8.1VortexUK/EQ2LexiconACTPlugin:dependabot/nuget/tests/EQ2Lexicon.ACTPlugin.Tests/Microsoft.NET.Test.Sdk-18.8.1Copy head branch name to clipboard