chore(deps): update dependency @nuxt/kit to v4

Author: renovate[bot]

packages/server-block-nuxt/package.json

@@ -51,7 +51,7 @@
   },
   "dependencies": {
     "@hebilicious/extract-sfc-block": "latest",
-    "@nuxt/kit": "3.9.3",
+    "@nuxt/kit": "4.2.1",
     "consola": "^3.2.3",
     "defu": "^6.1.4",
     "esbuild": "^0.25.0",