Revert Microsoft.SourceLink.GitHub to 8.0.0 (10.x incompatible with net462/netstandard2.0)

Author: gavinbarron

src/Microsoft.Graph.Core/Microsoft.Graph.Core.csproj

@@ -66,7 +66,7 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.IdentityModel.Protocols.OpenIdConnect" Version="8.16.0" />
     <PackageReference Include="Microsoft.IdentityModel.Validators" Version="8.16.0" />
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="10.0.201" PrivateAssets="All" />
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All" />
     <PackageReference Include="Microsoft.Kiota.Abstractions" Version="1.22.1" />
     <PackageReference Include="Microsoft.Kiota.Authentication.Azure" Version="1.22.1" />
     <PackageReference Include="Microsoft.Kiota.Serialization.Json" Version="1.22.1" />