chore(deps): bump @astrojs/mdx from 4.0.8 to 4.2.6

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 4.0.8 to 4.2.6.
- [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@4.2.6/packages/integrations/mdx)

---
updated-dependencies:
- dependency-name: "@astrojs/mdx"
  dependency-version: 4.2.6
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -16,7 +16,7 @@
 	},
 	"dependencies": {
 		"@astrojs/markdown-remark": "^6.1.0",
-		"@astrojs/mdx": "4.0.8",
+		"@astrojs/mdx": "4.2.6",
 		"@astrojs/react": "^4.2.0",
 		"@astrojs/rss": "4.0.11",
 		"@astrojs/sitemap": "3.2.1",