Offering to co-maintain Migrate Manifest

Since this project is covered by the security advisory policy, site moderators will not add as maintainers/co-maintainers people who cannot opt projects into security advisory policy. Moving this issue to the Drupal.org project ownership queue will have the get this offer back to this queue.

That's true, but we have a d10 release. We didn't but we do. Feel free to post some patches though, if there is some activity we can reconsider it.