Update Storage SDK used in EventGrid tests

Author: cormacpayne

src/EventGrid/EventGrid.Test/EventGrid.Test.csproj

@@ -15,7 +15,7 @@
     <PackageReference Include="Microsoft.Azure.Management.EventHub" Version="2.5.0" />
     <PackageReference Include="Microsoft.Azure.Management.Relay" Version="2.0.2" />
     <PackageReference Include="Microsoft.Azure.Management.ServiceBus" Version="2.1.0" />
-    <PackageReference Include="Microsoft.Azure.Management.Storage" Version="11.0.0" />
+    <PackageReference Include="Microsoft.Azure.Management.Storage" Version="12.0.0" />
   </ItemGroup>
 
 </Project>