Bump @astrojs/mdx from 0.19.7 to 1.1.3

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 0.19.7 to 1.1.3.
- [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/[email protected]/packages/integrations/mdx)

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

Signed-off-by: dependabot[bot] <[email protected]>

package.json

@@ -49,7 +49,7 @@
     "typescript-plugin-css-modules": "^5.0.1"
   },
   "dependencies": {
-    "@astrojs/mdx": "^0.19.7",
+    "@astrojs/mdx": "^1.1.3",
     "@astrojs/preact": "^2.2.2",
     "@astrojs/rss": "^2.4.4",
     "@astrojs/sitemap": "^2.0.1",