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

Author: renovate[bot]

package.json

@@ -204,7 +204,7 @@
     "lint-staged": "^11.0.0",
     "majo": "^0.10.1",
     "markdown-it": "^8.4.2",
-    "markdown-it-anchor": "^8.0.4",
+    "markdown-it-anchor": "^9.0.0",
     "markdown-it-container": "^3.0.0",
     "markdown-it-emoji": "^2.0.0",
     "markdown-it-table-of-contents": "^0.5.2",