fix(deps): update dependency astro to ^5.15.3

Author: renovate[bot]

package-lock.json

@@ -10,7 +10,7 @@
     "astro": "astro"
   },  "dependencies": {
     "@astrojs/starlight": "^0.36.1",
-    "astro": "^5.15.1",
+    "astro": "^5.15.3",
     "astro-auto-import": "^0.4.5",
     "remark-definition-list": "^2.0.0",
     "sharp": "^0.34.4",