fix(deps): update react monorepo to v19

Author: renovate[bot]

plugins/plugin-site/package.json

@@ -96,9 +96,9 @@
     "postcss-pxtorem": "6.1.0",
     "postcss-url": "10.1.3",
     "prismjs": "1.29.0",
-    "react": "18.3.1",
+    "react": "19.0.0",
     "react-chartjs-2": "5.2.0",
-    "react-dom": "18.3.1",
+    "react-dom": "19.0.0",
     "react-helmet": "6.1.0",
     "react-radio-group": "3.0.3",
     "react-timeago": "7.2.0",