Updates Clair container scanning GitLab CI configuration

What does this MR do?

It updates the container scanning GitLab CI configuration in vendor and doc.

Are there points in the code the reviewer needs to double check?

None

Why was this MR needed?

Sometimes the clair server container started before it's dc container was ready, and it failed.

Does this MR meet the acceptance criteria?

• [ ] Changelog entry added, if necessary
• Documentation created/updated
• [ ] API support added
• [ ] Tests added for this feature/bug
• Review
  • [ ] Has been reviewed by UX
  • [ ] Has been reviewed by Frontend
  • [ ] Has been reviewed by Backend
  • [ ] Has been reviewed by Database
• [ ] Conform by the merge request performance guides
• [ ] Conform by the style guides
• Squashed related commits together
• [ ] Internationalization required/considered
• [ ] End-to-end tests pass (package-and-qa manual pipeline job)

What are the relevant issue numbers?

Closes #45819 (closed)