Bump container registry to v3.26.0

What does this MR do?

3.26.0 (2022-02-15)

Bug Fixes

• soft delete empty repository records (batch 1) (8e58b4d)

Features

• do not limit redirections to Google Cloud CDN (ec64f51)
• handlers: add support for maxconcurrentimports in the import handler (3b789ae)
• log/context: log registry version everywhere (bdd2844)

Related issues

Related to gitlab-org/container-registry#592 (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
• Integration tests added to GitLab QA
• The impact any change in container size has should be evaluated