Update default values for expire_build_artifacts_worker

What does this MR do?

In gitlab-org/gitlab!46971 (merged) we have changed the cron configs for ExpireBuildArtifactsWorker to have it run more frequently. This MR updates chart examples to use the new value.

Related issues

gitlab-org/gitlab#247103 (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: gitlab-org/omnibus-gitlab!4734 (merged)

Skipped because this is documentation