Update dependency @mdx-js/loader to v3

Author: renovate[bot]

package.json

@@ -14,7 +14,7 @@
     "test": "start-server-and-test start http://localhost:3000 cy:run"
   },
   "dependencies": {
-    "@mdx-js/loader": "1.6.22",
+    "@mdx-js/loader": "3.0.0",
     "@next/mdx": "12.3.4",
     "next": "12.3.4",
     "react": "17.0.2",