feat: update Rspack examples for tailwindcss v4

Author: chenjiahan

pnpm-lock.yaml

@@ -11,7 +11,7 @@
   "dependencies": {
     "react": "^19.2.4",
     "react-dom": "^19.2.4",
-    "tailwindcss": "^4.1.18"
+    "tailwindcss": "^4.2.1"
   },
   "devDependencies": {
     "@rsbuild/core": "2.0.0-beta.2",

rsbuild/react-tailwindcss-v4/package.json

@@ -22,7 +22,7 @@
     "@tailwindcss/postcss": "^4.1.13",
     "@types/react": "^19.2.10",
     "react": "^19.2.4",
-    "tailwindcss": "^4.1.18",
+    "tailwindcss": "^4.2.1",
     "typescript": "^5.9.3"
   },
   "peerDependencies": {