Update dependency @mdx-js/react to v2

Author: renovate[bot]

website/package-lock.json

@@ -17,7 +17,7 @@
   "dependencies": {
     "@docusaurus/core": "2.3.1",
     "@docusaurus/preset-classic": "2.3.1",
-    "@mdx-js/react": "^1.6.22",
+    "@mdx-js/react": "^2.0.0",
     "clsx": "^1.2.1",
     "prism-react-renderer": "^1.3.5",
     "react": "^17.0.2",