Update react monorepo to v19

Author: renovate[bot]

package.json

@@ -23,8 +23,8 @@
     "leaflet-draw": "1.0.4",
     "leaflet.markercluster": "git+https://github.com/liqd/Leaflet.markercluster#liqd2212",
     "maplibregl-mapbox-request-transformer": "0.0.3",
-    "react": "18.3.1",
-    "react-dom": "18.3.1",
+    "react": "19.2.6",
+    "react-dom": "19.2.6",
     "react-flip-move": "3.0.5",
     "react-leaflet": "4.2.1",
     "react-markdown": "9.0.3",