Downgrade Microsoft.SourceLink.GitHub package version to 8.0.0

Author: mehyaa

Directory.Build.props

@@ -26,7 +26,7 @@
   </PropertyGroup>
 
   <ItemGroup Condition="'$(SourceLinkCreate)'=='true'">
-    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="10.0.0" PrivateAssets="All"/>
+    <PackageReference Include="Microsoft.SourceLink.GitHub" Version="8.0.0" PrivateAssets="All"/>
   </ItemGroup>
 
   <PropertyGroup Condition="'$(SourceLinkCreate)'=='true'">