Update astro monorepo

Author: renovate[bot]

projects-dashboard/package.json

@@ -10,10 +10,10 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/mdx": "^3.1.7",
+    "@astrojs/mdx": "^4.0.0",
     "@astrojs/rss": "^4.0.7",
     "@astrojs/sitemap": "^3.1.6",
-    "astro": "^4.15.10",
+    "astro": "^5.0.0",
     "@astrojs/check": "^0.9.3",
     "typescript": "^5.6.2"
   }