build(deps-dev): bump @astrojs/mdx from 2.0.3 to 2.3.1

Bumps [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) from 2.0.3 to 2.3.1.
- [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@2.3.1/packages/integrations/mdx)

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

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

package.json

@@ -39,7 +39,7 @@
 		"astro-font": "^0.0.72"
 	},
 	"devDependencies": {
-		"@astrojs/mdx": "2.0.3",
+		"@astrojs/mdx": "2.3.1",
 		"@astrojs/sitemap": "3.0.4",
 		"@astrojs/tailwind": "5.1.0",
 		"@pagefind/default-ui": "^1.0.4",