Update dependency @mdx-js/react to v2

Author: renovate-bot

docusaurus/my-website/package-lock.json

@@ -16,7 +16,7 @@
   "dependencies": {
     "@docusaurus/core": "2.0.0-beta.17",
     "@docusaurus/preset-classic": "2.0.0-beta.17",
-    "@mdx-js/react": "1.6.22",
+    "@mdx-js/react": "2.1.0",
     "clsx": "1.1.1",
     "prism-react-renderer": "1.3.1",
     "react": "17.0.2",