removed bump_tag and its invocation (#1036)

Author: unmarshall

.ci/bump_tag

@@ -113,7 +113,6 @@ etcd-druid:
           - ref_template: 'refs/tags/{VERSION}'
           - ref_template: 'refs/tags/api/{VERSION}'
           - ref_template: 'refs/tags/client/{VERSION}'
-          release_callback: .ci/bump_tag
         slack:
           default_channel: 'internal_scp_workspace'
           channel_cfgs: