Updated Component Model library for mapping validation

Updated the Component Model library used by the core `OnTopic` library to its latest version. This is used by the mapping service to validating models based on annotations.

Author: JeremyCaney

OnTopic/OnTopic.csproj

@@ -47,7 +47,7 @@
       <PrivateAssets>all</PrivateAssets>
       <IncludeAssets>runtime; build; native; contentfiles; analyzers</IncludeAssets>
     </PackageReference>
-    <PackageReference Include="System.ComponentModel.Annotations" Version="4.6.0">
+    <PackageReference Include="System.ComponentModel.Annotations" Version="4.7.0">
       <PrivateAssets>all</PrivateAssets>
     </PackageReference>
     <PackageReference Include="Microsoft.VisualStudio.Validation" Version="15.5.31">