feat: update RollbarNotifier dependency to 3.3.3 (#138)

Author: yen-kadokawa

rollbar_flutter/ios/rollbar_flutter.podspec

@@ -16,7 +16,7 @@ Connect your Flutter applications to Rollbar for error reporting.
   s.source_files = 'Classes/**/*'
   s.public_header_files = 'Classes/**/*.h'
   s.dependency 'Flutter'
-  s.dependency 'RollbarNotifier', '~> 3.2.0'
+  s.dependency 'RollbarNotifier', '~> 3.3.3'
   s.static_framework = true
   s.platform = :ios, '11.0'