Update astro monorepo

| datasource | package      | from    | to    |
| ---------- | ------------ | ------- | ----- |
| npm        | @astrojs/mdx | 3.1.7   | 4.0.0 |
| npm        | astro        | 4.15.11 | 5.0.0 |

Author: renovate[bot]

package.json

@@ -12,12 +12,12 @@
   },
   "dependencies": {
     "@astrojs/check": "^0.9.3",
-    "@astrojs/mdx": "^3.1.7",
+    "@astrojs/mdx": "^4.0.0",
     "@astrojs/rss": "^4.0.7",
     "@astrojs/sitemap": "^3.2.0",
     "@fontsource/roboto-mono": "^5.1.0",
     "@fontsource/roboto-slab": "^5.1.0",
-    "astro": "^4.15.11",
+    "astro": "^5.0.0",
     "astro-embed": "^0.7.2",
     "astro-expressive-code": "^0.37.0",
     "rehype-autolink-headings": "^7.1.0",