Update dependency @gitlab/duo-ui to v10.15.4

This MR contains the following updates:

Package	Type	Update	Change
@gitlab/duo-ui	dependencies	patch	10.15.0 -> 10.15.4

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

---

Release Notes

gitlab-org/duo-ui (@​gitlab/duo-ui)

v10.15.4

Compare Source

Bug Fixes

• trigger release pipeline after reverting MR 235 (a425969)

v10.15.3

Compare Source

Bug Fixes

• add important style tags to chat override vars (6fd2f5e)

v10.15.2

Compare Source

Bug Fixes

• duo_chat_message: added explicit z-index (df001af)

v10.15.1

Compare Source

Bug Fixes

• DuoChat: Fix VScode undo/redo (c770c94)

---

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 this update again.

---

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

---

This MR has been generated by Renovate Bot.