chore(deps): update dependency markdown-it-anchor to v9 (#263)

[skip netlify]

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

package-lock.json

@@ -45,7 +45,7 @@
     "husky": "9.1.7",
     "linkedom": "0.18.9",
     "lint-staged": "15.4.3",
-    "markdown-it-anchor": "8.6.7",
+    "markdown-it-anchor": "9.2.0",
     "markdownlint-cli2": "0.17.2",
     "markdownlint-config-fluid": "0.1.8",
     "npm-run-all2": "7.0.2",