fix(deps): update dependency astro to v5

Author: renovate[bot]

bun.lockb

@@ -19,7 +19,7 @@
   },
   "dependencies": {
     "@astrojs/starlight": "0.30.2",
-    "astro": "4.16.17",
+    "astro": "5.0.8",
     "sharp": "0.33.5"
   },
   "devDependencies": {