fix(deps): update dependency github-slugger to v2

Author: renovate-sh-app[bot]

package-lock.json

@@ -52,7 +52,7 @@
     "ejs": "^4.0.1",
     "express": "^4.18.0",
     "hast-util-to-html": "^9.0.0",
-    "github-slugger": "^1.5.0",
+    "github-slugger": "^2.0.0",
     "gray-matter": "^4.0.3",
     "minimist": "^1.2.8"
   },