chore: allow react 19 as peer dependency

Author: fgnass

packages/decap-cms-app/package.json

@@ -80,8 +80,8 @@
     "uuid": "^8.3.2"
   },
   "peerDependencies": {
-    "react": "^18.2.0",
-    "react-dom": "^18.2.0"
+    "react": "^18.2.0 || ^19.0.0",
+    "react-dom": "^18.2.0 || ^19.0.0"
   },
   "incrementToForceBump": 2
 }