chore: put back reference to Microsoft.SourceLink.GitHub

Author: maurei

src/JsonApiDotNetCore/JsonApiDotNetCore.csproj

@@ -29,6 +29,7 @@
     <PackageReference Include="Newtonsoft.Json" Version="11.0.2" />
     <PackageReference Include="System.Memory" Version="4.5.0" />
     <PackageReference Include="System.ValueTuple" Version="$(TuplesVersion)" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="1.0.0-beta-62925-02" PrivateAssets="All" />
   </ItemGroup>
 
   <!--