Changes

Fix to run .NET Framework Tests (4.5, 4.6, etc)

• updating MSTest.TestAdapter to latest stable version
• updating MSTest.TestFramework to latest stable version
• updating Microsoft.TestPlatform.TestHost to 16.2.0

Checklist

• I ran Unit Tests locally.
• CHANGELOG.md updated with one line description of the fix, and a link to the original issue if available.

For significant contributions please make sure you have completed the following items:

• Design discussion issue #
• Changes in public surface reviewed

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