chore(deps): Bump @astrojs/mdx from 4.3.9 to 4.3.13 (#257)

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Author: dependabot[bot]

apps/spuxx-astro/package.json

@@ -11,7 +11,7 @@
     "check": "astro check"
   },
   "dependencies": {
-    "@astrojs/mdx": "4.3.9",
+    "@astrojs/mdx": "4.3.13",
     "@astrojs/sitemap": "3.7.0",
     "@astrojs/solid-js": "5.1.3",
     "@spuxx/browser-utils": "1.13.0",