Update dependency markdown-it-anchor to v9

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
markdown-it-anchor	8.6.7 -> 9.0.1

---

Release Notes

valeriangalliat/markdown-it-anchor (markdown-it-anchor)

v9.0.1

Compare Source

• Fix types following upgrade. ([#​131])

v9.0.0

Compare Source

• Support markdown-it 14. This may be breaking hence the major. ([#​129], [#​128])

---

Configuration

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

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, 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 Mend Renovate. View repository job log here.