Add type on `getContainerExtension` for future compat
Add type on `getContainerExtension` for future compat

User Deprecated: Method "Symfony\Component\HttpKernel\Bundle\Bundle::getContainerExtension()" might add "?ExtensionInterface" as a native return type declaration in the future. Do the same in child class "Overblog\GraphQLBundle\OverblogGraphQLBundle" now to avoid errors or add an explicit @return annotation to suppress this message.

overblog/GraphQLBundle