Add missing constraint

Author: parlough

pkg/fake_gcloud/pubspec.yaml

@@ -11,7 +11,7 @@ dependencies:
   crypto: ^3.0.0
   gcloud: ^0.8.18
   logging: '>=0.11.3 <2.0.0'
-  _discoveryapis_commons:
+  _discoveryapis_commons: ^1.0.7
 
 dev_dependencies:
   coverage: any # test already depends on it