fix(deps): update dependency rehype-external-links to v3

Author: renovate[bot]

package-lock.json

@@ -19,7 +19,7 @@
   "dependencies": {
     "@galactiks/contentlayer": "0.2.9",
     "contentlayer": "0.3.4",
-    "rehype-external-links": "2.1.0",
+    "rehype-external-links": "3.0.0",
     "rehype-slug": "5.1.0",
     "remark-gfm": "3.0.1"
   },