go back to react 18.3

Author: masenf

reflex/constants/installer.py

@@ -185,8 +185,8 @@ class Commands(SimpleNamespace):
         "next": "15.1.5",
         "next-sitemap": "4.2.3",
         "next-themes": "0.4.4",
-        "react": "19.0.0",
-        "react-dom": "19.0.0",
+        "react": "18.3.0",
+        "react-dom": "18.3.0",
         "react-focus-lock": "2.13.5",
         "socket.io-client": "4.8.1",
         "universal-cookie": "7.2.2",