Update reference to strongname packages

Author: ryuyu

src/NuGet.Services.Validation.Orchestrator/NuGet.Services.Validation.Orchestrator.csproj

@@ -134,7 +134,7 @@
     </None>
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="AnglicanGeek.MarkdownMailer.StrongName">
+    <PackageReference Include="NuGet.StrongName.AnglicanGeek.MarkdownMailer">
       <Version>1.2.0</Version>
     </PackageReference>
     <PackageReference Include="NuGet.Services.Validation.Issues">