Update gcp batch lib version in setup.py

Differential Revision: D42273178

Pull Request resolved: #675

Author: priyaramani

setup.py

@@ -79,7 +79,7 @@ def get_nightly_version():
         },
         extras_require={
             "gcp_batch": [
-                "google-cloud-batch>=0.3.1",
+                "google-cloud-batch>=0.5.0",
                 "google-cloud-logging>=3.0.0",
                 "google-cloud-runtimeconfig>=0.33.2",
             ],