Update gitlab-agent-base-container-images

This MR contains the following updates:

Package	Update	Change
base container images	digest	df73bc6 -> 273620e
base container images	digest	c2a67f6 -> 7ec4127
base container images	digest	668bae2 -> e856be2
base container images	digest	b1f3cd3 -> 759bd2b

MR created with the help of gitlab-org/frontend/renovate-gitlab-bot

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

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

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

👻 Immortal: This MR will be recreated if closed unmerged. Get config help if that's undesired.

---

• If you want to rebase/retry this MR, click this checkbox.

---

This MR has been generated by Renovate Bot.