internal-channels/fast: Promote 4.21.15

[openshift-ota-bot]

It was promoted to the feeder candidate by 84d968e (Merge pull request #9406 from openshift/pr_candidate_4.21.15, 2026-05-13) 4:25:37.992967 ago. https://access.redhat.com/errata/RHBA-2026:16162 is public.

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