fix: add ref=main to nested plugin includes

Devbox defaults to fetching from the 'master' branch. Since this repo
uses 'main', the nested GitHub includes need an explicit ref parameter.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: abueide

plugins/react-native/plugin.json

@@ -3,8 +3,8 @@
   "version": "0.0.3",
   "description": "Aggregates the Android and iOS Devbox plugins for React Native projects.",
   "include": [
-    "github:segment-integrations/devbox-plugins?dir=plugins/android",
-    "github:segment-integrations/devbox-plugins?dir=plugins/ios"
+    "github:segment-integrations/devbox-plugins?dir=plugins/android&ref=main",
+    "github:segment-integrations/devbox-plugins?dir=plugins/ios&ref=main"
   ],
   "packages": {
     "curl": "latest",