chore(deps): bump @astrojs/mdx from 3.1.4 to 3.1.5

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 3.1.4 to 3.1.5.
- [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-patch
...

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

package.json

@@ -12,7 +12,7 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/mdx": "^3.1.4",
+    "@astrojs/mdx": "^3.1.5",
     "@astrojs/react": "^3.6.2",
     "@astrojs/rss": "^4.0.7",
     "@astrojs/sitemap": "^3.1.6",