feat: add react v19 to peer deps

Author: Yonom

packages/react-resizable-panels/package.json

@@ -81,8 +81,8 @@
     "react-dom": "experimental"
   },
   "peerDependencies": {
-    "react": "^16.14.0 || ^17.0.0 || ^18.0.0",
-    "react-dom": "^16.14.0 || ^17.0.0 || ^18.0.0"
+    "react": "^16.14.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc",
+    "react-dom": "^16.14.0 || ^17.0.0 || ^18.0.0 || ^19.0.0 || ^19.0.0-rc"
   },
   "browserslist": [
     "Chrome 79"