chore(deps): update yarn to v4.9.4

Author: renovate[bot]

package.json

@@ -14,7 +14,7 @@
     "astro": "^5.6.1",
     "sharp": "^0.34.3"
   },
-  "packageManager": "[email protected].2",
+  "packageManager": "[email protected].4",
   "engines": {
     "node": ">=20.0.0 <=22.18.0",
     "npm": "please-use-yarn",