Automatically rescheduled merge_requests to 12.4

The following were rescheduled because the previous milestone was already closed:

1. !16418 (merged) Conan snapshot and manifest API endpoints Category:Package Registry, Deliverable, Enterprise Edition, database, databaseapproved, devopspackage, feature, feature flag, ~"group::package", ~"workflow::In dev"

Please reschedule accordingly if they're wrong.