Bump @astrojs/mdx from 4.3.13 to 5.0.2 (#3412)

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 4.3.13 to 5.0.2.
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/mdx/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/mdx@5.0.2/packages/integrations/mdx)

---
updated-dependencies:
- dependency-name: "@astrojs/mdx"
  dependency-version: 5.0.2
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

landing/package.json

@@ -11,7 +11,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/mdx": "^4.3.13",
+    "@astrojs/mdx": "^5.0.2",
     "@astrojs/vercel": "^9.0.4",
     "@polar-sh/astro": "^0.7.3",
     "astro": "^5.18.0",