Bump @astrojs/mdx from 3.1.5 to 3.1.7

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 3.1.5 to 3.1.7.
- [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@3.1.7/packages/integrations/mdx)

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

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

Author: dependabot[bot]

package-lock.json

@@ -14,7 +14,7 @@
     "sync": "astro sync"
   },
   "dependencies": {
-    "@astrojs/mdx": "^3.1.5",
+    "@astrojs/mdx": "^3.1.7",
     "@astrojs/netlify": "^5.5.1",
     "@astrojs/rss": "^4.0.7",
     "@astrojs/sitemap": "^3.1.6",