Some Git loader tasks for gitlab.com and bitbucket.org origins have "lister_name: github" in their arguments

Four tasks with this kind of arguments were scheduled somehow:

{args: [], kwargs: {lister_instance_name: github, lister_name: github, pack_size_bytes: 34359738368, url: https://gitlab.com/0EFB6/wilson-arch-iso.git

}, task_name: swh.loader.git.tasks.UpdateGitRepository}

https://sentry.softwareheritage.org/share/issue/4db26d9b9bd042b4a75d0aa15669789a/

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Migrated from T4661 (view on Phabricator)