Add Clerk 6 Next.js 15 Private Demo (#32326)

GitOrigin-RevId: 95d8d14ef58c3a99855728a01ccd3a92ce1d2f10

Author: thomasballinger

package.json

@@ -240,8 +240,8 @@
   "peerDependencies": {
     "@auth0/auth0-react": "^2.0.1",
     "@clerk/clerk-react": "^4.12.8 || ^5.0.0",
-    "react": "^17.0.2 || ^18.0.0 || ^19.0.0-0",
-    "react-dom": "^17.0.2 || ^18.0.0 || ^19.0.0-0"
+    "react": "^17.0.2 || ^18.0.0 || ^19.0.0-0 || ^19.0.0",
+    "react-dom": "^17.0.2 || ^18.0.0 || ^19.0.0-0 || ^19.0.0"
   },
   "peerDependenciesMeta": {
     "react": {