Update tailscale/tailscale Docker tag to v1.70.0

[chemical-soup]

This PR contains the following updates:

Package	Update	Change
tailscale/tailscale	minor	v1.68.1 -> v1.70.0

---

Configuration

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

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR is behind base branch, or you tick the rebase/retry checkbox.

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

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot.