Bump markdown-it-anchor from 9.0.1 to 9.1.0

Bumps [markdown-it-anchor](https://github.com/valeriangalliat/markdown-it-anchor) from 9.0.1 to 9.1.0.
- [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@v9.0.1...v9.1.0)

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

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

Author: dependabot[bot]

package-lock.json

@@ -28,7 +28,7 @@
     "eleventy-sass": "^2.2.6",
     "html-entities": "^2.5.2",
     "js-yaml": "^4.1.0",
-    "markdown-it-anchor": "^9.0.1",
+    "markdown-it-anchor": "^9.1.0",
     "markdown-it-attrs": "^4.2.0",
     "markdown-it-github-alerts": "^0.3.0",
     "string-strip-html": "~8.5.0"