Merge branch 'sh-update-mailroom-gem' into 'master'

Update gitlab-mail_room to v0.0.23

See merge request https://gitlab.com/gitlab-org/gitlab/-/merge_requests/116494



Merged-by: Michael Kozono <mkozono@gitlab.com>
Approved-by: Tyler Amos <tamos@gitlab.com>
Approved-by: Michael Kozono <mkozono@gitlab.com>
Co-authored-by: Stan Hu <stanhu@gmail.com>