Update dependency tailwindcss to v4

Author: renovate[bot]

package.json

@@ -11,7 +11,7 @@
     "url": "git+https://github.com/netlify/tailwindcss-first-line.git"
   },
   "devDependencies": {
-    "tailwindcss": "^2.0.3"
+    "tailwindcss": "^4.0.0"
   },
   "author": "Netlify",
   "contributors": [