Bump markdown-it-anchor from 8.6.7 to 9.0.0

Bumps [markdown-it-anchor](https://github.com/valeriangalliat/markdown-it-anchor) from 8.6.7 to 9.0.0.
- [Release notes](https://github.com/valeriangalliat/markdown-it-anchor/releases)
- [Changelog](https://github.com/valeriangalliat/markdown-it-anchor/blob/master/CHANGELOG.md)
- [Commits](valeriangalliat/markdown-it-anchor@v8.6.7...v9.0.0)

---
updated-dependencies:
- dependency-name: markdown-it-anchor
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>

package.json

@@ -34,7 +34,7 @@
     "make-array": "^1.0.5",
     "markdown-it": "^14.0.0",
     "markdown-it-abbr": "^2.0.0",
-    "markdown-it-anchor": "^8.6.7",
+    "markdown-it-anchor": "^9.0.0",
     "markdown-it-attrs": "^4.1.6",
     "markdown-it-deflist": "^3.0.0",
     "markdown-it-emoji": "^3.0.0",