Update Node dependencies for SignalR

Author: BrennanConroy

eng/PatchConfig.props

@@ -90,6 +90,8 @@ Later on, this will be checked using this condition:
   </PropertyGroup>
   <PropertyGroup Condition=" '$(VersionPrefix)' == '2.1.26' ">
     <PackagesInPatch>
+      @aspnet/signalr;
+      @aspnet/signalr-protocol-msgpack;
     </PackagesInPatch>
   </PropertyGroup>
 </Project>