Added react ^19 and ^19.0.0-rc as peer dep

Added react ^19 and ^19.0.0-rc as peer dependency.
Some projects like Next.js already utilize react 19 release candidate, so that installing react-datepicker can only be done with `--legacy-peer-deps`.
I have tested the `react-datepicker` with Next.js and react 19 release candidate and it works.
So I have added react ^19 and ^19.0.0-rc as peer dep

package.json

@@ -78,8 +78,8 @@
     "typescript": "^5.5.4"
   },
   "peerDependencies": {
-    "react": "^16.9.0 || ^17 || ^18",
-    "react-dom": "^16.9.0 || ^17 || ^18"
+    "react": "^16.9.0 || ^17 || ^18 || ^19 || ^19.0.0-rc",
+    "react-dom": "^16.9.0 || ^17 || ^18 || ^19 || ^19.0.0-rc"
   },
   "dependencies": {
     "@floating-ui/react": "^0.26.23",