Update MessagePack to v2.0 for SignalR (#18133)

Author: tebeco

eng/Versions.props

@@ -199,7 +199,7 @@
     <SystemCommandlineExperimentalPackageVersion>0.3.0-alpha.19317.1</SystemCommandlineExperimentalPackageVersion>
     <SystemComponentModelPackageVersion>4.3.0</SystemComponentModelPackageVersion>
     <SystemNetHttpPackageVersion>4.3.2</SystemNetHttpPackageVersion>
-    <SystemThreadingTasksExtensionsPackageVersion>4.5.2</SystemThreadingTasksExtensionsPackageVersion>
+    <SystemThreadingTasksExtensionsPackageVersion>4.5.3</SystemThreadingTasksExtensionsPackageVersion>
     <!-- Packages developed by @aspnet, but manually updated as necessary. -->
     <LibuvPackageVersion>1.10.0</LibuvPackageVersion>
     <MicrosoftAspNetWebApiClientPackageVersion>5.2.6</MicrosoftAspNetWebApiClientPackageVersion>
@@ -242,7 +242,7 @@
     <IdentityServer4PackageVersion>3.0.0</IdentityServer4PackageVersion>
     <IdentityServer4StoragePackageVersion>3.0.0</IdentityServer4StoragePackageVersion>
     <IdentityServer4EntityFrameworkStoragePackageVersion>3.0.0</IdentityServer4EntityFrameworkStoragePackageVersion>
-    <MessagePackPackageVersion>1.7.3.7</MessagePackPackageVersion>
+    <MessagePackPackageVersion>2.0.335</MessagePackPackageVersion>
     <MoqPackageVersion>4.10.0</MoqPackageVersion>
     <MonoCecilPackageVersion>0.10.1</MonoCecilPackageVersion>
     <NewtonsoftJsonBsonPackageVersion>1.0.2</NewtonsoftJsonBsonPackageVersion>