chore(deps): update mdx monorepo to v1.6.22

Author: renovate[bot]

package.json

@@ -12,8 +12,8 @@
     "node": "~16"
   },
   "dependencies": {
-    "@mdx-js/mdx": "1.6.18",
-    "@mdx-js/react": "1.6.18",
+    "@mdx-js/mdx": "1.6.22",
+    "@mdx-js/react": "1.6.22",
     "classnames": "2.2.6",
     "gatsby": "2.24.68",
     "gatsby-image": "2.4.21",