Update RubyGems Bundler install frozen scripts

--frozen
  - prevent lockfile updates
  - require existing lockfile
--deployment
  - always install to 'vendor/bundle' ignoring .bundle/config BUNDLE_PATH
  - also ignore system gems, stick to local proj
  - safer for CI

Author: leotm

package.json

@@ -11,7 +11,7 @@
     "android": "react-native run-android --active-arch-only",
     "android:release": "react-native run-android --active-arch-only --mode release",
     "gems": "bundle install",
-    "gems:frozen": "bundle install --frozen",
+    "gems:frozen": "bundle install --deployment",
     "ios": "react-native run-ios",
     "ios:release": "react-native run-ios --mode Release",
     "ios:light": "xcrun simctl ui booted appearance light",