fix(deps): update dependency @astrojs/starlight to v0.38.4

Author: renovate[bot]

package.json

@@ -25,7 +25,7 @@
   },
   "dependencies": {
     "@astrojs/check": "0.9.9",
-    "@astrojs/starlight": "0.37.7",
+    "@astrojs/starlight": "0.38.4",
     "@astrojs/starlight-tailwind": "4.0.2",
     "@tailwindcss/vite": "4.2.4",
     "astro": "5.18.1",