Update dependency github-slugger to v2 (#344)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [github-slugger](https://togithub.com/Flet/github-slugger) | [`1.5.0` -> `2.0.0`](https://renovatebot.com/diffs/npm/github-slugger/1.5.0/2.0.0) | [![age](https://developer.mend.io/api/mc/badges/age/npm/github-slugger/2.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/github-slugger/2.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/github-slugger/1.5.0/2.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/github-slugger/1.5.0/2.0.0?slim=true)](https://docs.renovatebot.com/merge-confidence/) |

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### Release Notes

<details>
<summary>Flet/github-slugger (github-slugger)</summary>

### [`v2.0.0`](https://togithub.com/Flet/github-slugger/blob/HEAD/CHANGELOG.md#200-2022-10-27)

[Compare Source](https://togithub.com/Flet/github-slugger/compare/v1.5.0...2.0.0)

-   Use ESM
    **breaking**: please read [this guide](https://gist.github.com/sindresorhus/a39789f98801d908bbc7ff3ecc99d99c)
-   Add types
    **breaking**: tiny chance of breaking, use a new version of TS and it’ll work

</details>

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### 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 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

---

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.github/actions/validate-docs-links/package.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "@actions/core": "^1.10.0",
     "@actions/github": "^6.0.0",
-    "github-slugger": "1.5.0",
+    "github-slugger": "2.0.0",
     "gray-matter": "4.0.3",
     "rehype-raw": "4.0.2",
     "remark-parse": "7.0.2",