Update Testing framework to 2.2.1

Author: renovate[bot]

Directory.Packages.props

@@ -4,7 +4,7 @@
   <PropertyGroup>
     <ManagePackageVersionsCentrally>true</ManagePackageVersionsCentrally>
     <CentralPackageTransitivePinningEnabled>true</CentralPackageTransitivePinningEnabled>
-    <MicrosoftTestingPlatformVersion>2.1.0</MicrosoftTestingPlatformVersion>
+    <MicrosoftTestingPlatformVersion>2.2.1</MicrosoftTestingPlatformVersion>
     <MicroBuildVersion>2.0.208</MicroBuildVersion>
     <CodeAnalysisVersion>3.11.0</CodeAnalysisVersion>
     <CodefixTestingVersion>1.1.3</CodefixTestingVersion>