fix(deps): update @mdx-js to ^1.5.2

Author: renovate-bot

package.json

@@ -4,8 +4,8 @@
   "version": "3.0.0",
   "author": "james@faeldon.com",
   "dependencies": {
-    "@mdx-js/mdx": "^1.0.21",
-    "@mdx-js/react": "^1.0.21",
+    "@mdx-js/mdx": "^1.5.2",
+    "@mdx-js/react": "^1.5.2",
     "babel-plugin-styled-components": "^1.10.6",
     "gatsby": "^2.16.0",
     "gatsby-mdx": "^0.6.3",