⬇️(frontend) react 18.3.1 -> 18.2.0

Downgrade react to 18.2.0.
It seems to have a compatibility issue
with @openfun/cunningham-react.

src/frontend/apps/desk/package.json

@@ -21,9 +21,9 @@
     "lodash": "4.17.21",
     "luxon": "3.4.4",
     "next": "14.2.3",
-    "react": "18.3.1",
+    "react": "18.2.0",
     "react-aria-components": "1.1.1",
-    "react-dom": "18.3.1",
+    "react-dom": "18.2.0",
     "react-i18next": "14.1.1",
     "react-select": "5.8.0",
     "styled-components": "6.1.8",