fix(deps): update dependency yjs to ^13.6.18 (main)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
yjs (source)	^13.6.16 -> ^13.6.18

---

Release Notes

yjs/yjs (yjs)

### [`v13.6.18`](https://togithub.com/yjs/yjs/releases/tag/v13.6.18) [Compare Source](https://togithub.com/yjs/yjs/compare/v13.6.17...v13.6.18) - fix [#​645](https://togithub.com/yjs/yjs/issues/645) [yjs/y-utility#8](https://togithub.com/yjs/y-utility/issues/8) [`2e5abad`](https://togithub.com/yjs/yjs/commit/2e5abad7) - add lexical editor [`3f1746f`](https://togithub.com/yjs/yjs/commit/3f1746f3) ### [`v13.6.17`](https://togithub.com/yjs/yjs/releases/tag/v13.6.17) [Compare Source](https://togithub.com/yjs/yjs/compare/v13.6.16...v13.6.17) - fix creating relative position from json when type name is the empty string [`d4dac55`](https://togithub.com/yjs/yjs/commit/d4dac558) - Merge pull request [#​649](https://togithub.com/yjs/yjs/issues/649) from szv/readme-fixes [`a47a48b`](https://togithub.com/yjs/yjs/commit/a47a48b8) - Fixed markdown link for ellipsus.org in README.md [`2e79d03`](https://togithub.com/yjs/yjs/commit/2e79d036) - Fixed star icon in README.md [`88506f6`](https://togithub.com/yjs/yjs/commit/88506f6d)

---

Configuration

📅 Schedule: Branch creation - "every weekend" in timezone Europe/Berlin, Automerge - At any time (no schedule defined).

🚦 Automerge: Disabled by config. Please merge this manually once you are satisfied.

♻ 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.