Bump container registry to v4.28.0 (cny)

What does this MR do?

4.28.0 (2025-09-23)

Features

• add metrics for number of total and applied migrations (b0f4639)
• api: enable DLB for OCI read blob endpoint (7da3001)
• make gcs_next driver the main storage driver for gcs (ddafd4e)
• registry: import-command: skip recently pre imported repositories (187d77f)

Bug Fixes

• log level parsing should ignore unknown log levels (196650b)
• make too many retries situations more explicit (0b8ce13)

Related to gitlab-org/container-registry#1684 (closed)

Author Check-list

Please read the Contributing document and once you do, complete the following:

• Check if all of the following apply:
  • Assign to the correct reviewer per the contributing document
  • Apply the correct metadata per the contributing document
  • Link to related MRs for applying the changes on other environments
  • Link to related Chef changes
  • If necessary link to a Criticality 4 Change Request issue

Reviewer Check-list

• Check if all of the following apply:
  • Reviewed the diff jobs to confirm changes are as expected
  • No changes shown in the diffs not associated with this MR - This may require a rebase or further investigation

Applier Check-list

• Make sure there is no ongoing deployment for the affected envs before merging (see #announcements slack channel)