fix(deps): update dependency @astrojs/mdx to v0.15.2

Author: renovate[bot]

package.json

@@ -11,7 +11,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/mdx": "0.15.1",
+    "@astrojs/mdx": "0.15.2",
     "@astrojs/react": "1.2.2",
     "@astrojs/rss": "1.2.1",
     "@astrojs/sitemap": "1.0.0",