Update pubspec.yaml

Author: brianquinlan

pkgs/cupertino_http/example/pubspec.yaml

@@ -23,15 +23,15 @@ dev_dependencies:
   convert: ^3.1.1
   crypto: ^3.0.3
   dart_flutter_team_lints: ^3.0.0
-  ffi: ^2.0.1
+  ffi: ^2.1.4
   flutter_test:
     sdk: flutter
   http_client_conformance_tests:
     path: ../../http_client_conformance_tests/
   http_profile: ^0.1.0
   integration_test:
     sdk: flutter
-  objective_c: ^8.1.0
+  objective_c: ^9.0.0
   test: ^1.21.1
   web_socket: '^1.0.0'
   web_socket_conformance_tests: