Update confluentinc/cp-base-new Docker tag to v7.7.1

This MR contains the following updates:

Package	Type	Update	Change
confluentinc/cp-base-new	ironbank-docker	minor	7.6.2 -> 7.7.1
confluentinc/cp-base-new	stage	minor	7.6.2 -> 7.7.1

---

⚠ Warning

Some dependencies could not be looked up. Check the warning logs for more information.

---

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.

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

---

• If you want to rebase/retry this MR, check this box

---

This MR has been generated by Renovate Bot.