Draft: SKIP UPDATE CHECK Update ironbank/gitlab/gitlab-runner/gitlab-runner Docker tag to v15 - autoclosed

This MR contains the following updates:

Package	Update	Change
ironbank/gitlab/gitlab-runner/gitlab-runner	major	14.4.0 -> v15.4.0
ironbank/gitlab/gitlab-runner/gitlab-runner	major	v14.4.0 -> v15.4.0

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Configuration

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🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ Rebasing: Whenever MR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this MR and you won't be reminded about these updates again.

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This MR has been generated by Renovate Bot.