packages: Update @astrojs/starlight ^0.31.0 and astro ^5.1.5

Author: thomasbnt

package.json

@@ -10,9 +10,9 @@
     "astro": "astro"
   },
   "dependencies": {
-    "@astrojs/starlight": "^0.30.2",
+    "@astrojs/starlight": "^0.31.0",
     "@lunariajs/starlight": "^0.1.1",
-    "astro": "^5.0.9",
+    "astro": "^5.1.5",
     "astro-matomo": "^1.7.0",
     "sharp": "^0.33.5"
   },