chore(deps-dev): bump markdown-it-anchor from 8.6.2 to 8.6.3

Bumps [markdown-it-anchor](https://github.com/valeriangalliat/markdown-it-anchor) from 8.6.2 to 8.6.3.
- [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@v8.6.2...v8.6.3)

---
updated-dependencies:
- dependency-name: markdown-it-anchor
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

package.json

@@ -14,7 +14,7 @@
   "author": "Stefan Pfaffel",
   "license": "MIT",
   "devDependencies": {
-    "markdown-it-anchor": "^8.4.1",
+    "markdown-it-anchor": "^8.6.3",
     "markdown-it-attrs": "^4.1.4",
     "nodemon": "^2.0.16",
     "postcss": "^8.4.13",