Update tj-actions/branch-names action to v6

This MR contains the following updates:

Package	Type	Update	Change
tj-actions/branch-names	action	major	v5 -> v6

---

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: Renovate will not automatically rebase this PR, because other commits have been found.

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

---

• If you want to rebase/retry this MR, click this checkbox. ⚠ Warning: custom changes will be lost.

---

This MR has been generated by Renovate Bot.