Offering to co-maintain Admin Toolbar

This module has been merged in the Admin Toolbar → project.

As a side note, 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.

We have new maintainers now, so I think its safe to close this now.