[Snyk] Security upgrade MSTest.TestAdapter from 1.1.18 to 2.2.1#6

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snyk-fix-b57168c7f5c3c2aae1eae435b050389c

Commits on Nov 17, 2021

fix: DevSkim/src/Microsoft.DevSkim/Microsoft.DevSkim.Tests/Microsoft.DevSkim.Tests.csproj to reduce vulnerabilities
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