Bump Container Registry to v3.31.0-gitlab

What does this MR do?

3.31.0 (2022-03-01)

Bug Fixes

• enforce single access record for import route auth tokens (c476307)
• use unique value for /gitlab/v1 API route names on metrics (8e6550a)
• handlers: return a proper error code for invalid import query value (caabf19)

Features

• add support for custom oras media types (625f7a3)
• migration: use Seperate Context for Import Notifications (62bf886)
• implement import GET route (d67ba80)

Related issues

Related to gitlab-org/container-registry#610 (closed)

Checklist

See Definition of done.

For anything in this list which will not be completed, please provide a reason in the MR discussion.

Required

• Merge Request Title and Description are up to date, accurate, and descriptive
• MR targeting the appropriate branch
• MR has a green pipeline on GitLab.com

Expected (please provide an explanation if not completing)

• Test plan indicating conditions for success has been posted and passes
• Documentation created/updated
• Tests added
• Integration tests added to GitLab QA
• Equivalent MR/issue for omnibus-gitlab opened