Add public publishConfig so nightly can successfully publish (#6853)

Author: LFDanLu

packages/@react-spectrum/s2/package.json

@@ -113,5 +113,8 @@
   "peerDependencies": {
     "react": "^18.0.0 || ^19.0.0",
     "react-dom": "^18.0.0 || ^19.0.0"
+  },
+  "publishConfig": {
+    "access": "public"
   }
 }