fix(repo): Update React to v19 for Next.js 15 compatibility in playground (#6590)

Author: LauraBeatris

playground/nextjs/package.json

@@ -14,13 +14,13 @@
     "@clerk/nextjs": "canary",
     "@clerk/themes": "canary",
     "next": "^15",
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0"
+    "react": "^19.1.1",
+    "react-dom": "^19.1.1"
   },
   "devDependencies": {
     "@types/node": "18.8.3",
-    "@types/react": "18.2.33",
-    "@types/react-dom": "18.2.14",
+    "@types/react": "19.1.10",
+    "@types/react-dom": "19.1.7",
     "eslint": "8.24.0",
     "eslint-config-next": "12.3.1",
     "typescript": "4.8.4"