Unpin 2.1.12 package versions (#11091)

Author: mmitche

build/dependencies.props

@@ -4,6 +4,8 @@
     <!-- MicrosoftNETCoreApp21PackageVersion is assigned at the bottom so it can automatically pick up MicrosoftNETCoreAppPackageVersion in an orchestrated build. -->
     <MicrosoftNETCoreAppPackageVersion>2.1.11</MicrosoftNETCoreAppPackageVersion>
     <MicrosoftNETCoreDotNetAppHostPackageVersion>2.1.11</MicrosoftNETCoreDotNetAppHostPackageVersion>
+
+	<SystemThreadingTasksExtensionsPackageVersion>4.5.2</SystemThreadingTasksExtensionsPackageVersion>
   </PropertyGroup>
 
   <Import Project="$(DotNetPackageVersionPropsPath)" Condition="'$(DotNetPackageVersionPropsPath)' != ''" />
@@ -206,7 +208,6 @@
     <SystemValueTuplePackageVersion>4.5.0</SystemValueTuplePackageVersion>
     <SystemIOPipelinesPackageVersion>4.5.3</SystemIOPipelinesPackageVersion>
     <SystemNetWebSocketsWebSocketProtocolPackageVersion>4.5.3</SystemNetWebSocketsWebSocketProtocolPackageVersion>
-    <SystemThreadingTasksExtensionsPackageVersion>4.5.2</SystemThreadingTasksExtensionsPackageVersion>
     <Utf8JsonPackageVersion>1.3.7</Utf8JsonPackageVersion>
     <VisualStudio_NewtonsoftJsonPackageVersion>9.0.1</VisualStudio_NewtonsoftJsonPackageVersion>
     <VSIX_MicrosoftCodeAnalysisCommonPackageVersion>2.8.0</VSIX_MicrosoftCodeAnalysisCommonPackageVersion>