chore(deps): update example dependencies to v19

Author: renovate[bot]

example/package.json

@@ -20,16 +20,16 @@
     "@sanity/vision": "^3.74.0",
     "next": "^14.2.3",
     "next-sanity": "^9.8.51",
-    "react": "^18.3.1",
-    "react-dom": "^18.3.1",
+    "react": "^19.1.1",
+    "react-dom": "^19.1.1",
     "sanity": "^3.74.0",
     "sanity-plugin-mux-input": "^2.4.1",
     "styled-components": "^6.1.14"
   },
   "devDependencies": {
     "@types/node": "^20.12.12",
-    "@types/react": "^18.3.18",
-    "@types/react-dom": "^18.3.5",
+    "@types/react": "^19.1.8",
+    "@types/react-dom": "^19.1.6",
     "typescript": "5.7.3"
   }
 }