Update dependency tailwindcss to v4

Author: brianclemens

package.json

@@ -31,7 +31,7 @@
     "@heroicons/react": "^1.0.6",
     "gh-pages": "^6.1.1",
     "prettier": "^3.2.5",
-    "tailwindcss": "^3.4.3"
+    "tailwindcss": "^4.0.0"
   },
   "keywords": [
     "gatsby"