bump @astrojs/mdx from 5.0.2 to 5.0.3

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 5.0.2 to 5.0.3.
- [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@5.0.3/packages/integrations/mdx)

---
updated-dependencies:
- dependency-name: "@astrojs/mdx"
  dependency-version: 5.0.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -30,7 +30,7 @@
   },
   "devDependencies": {
     "@astrojs/check": "^0.9.8",
-    "@astrojs/mdx": "^5.0.2",
+    "@astrojs/mdx": "^5.0.3",
     "@astrojs/react": "^5.0.1",
     "@astrojs/sitemap": "^3.7.1",
     "@eslint/js": "^10.0.1",