fix(deps): update dependency tailwindcss to v4

Author: renovate[bot]

package.json

@@ -15,6 +15,6 @@
   "dependencies": {
     "@astrojs/tailwind": "^6.0.0",
     "astro": "^5.0.0",
-    "tailwindcss": "^3.3.3"
+    "tailwindcss": "^4.0.0"
   }
 }