Spell 'cgo' correctly...

Author: dougthor42

.bazelci/presubmit.yml

@@ -159,7 +159,7 @@ tasks:
       - "--enable_workspace"
       - "--keep_going"
       - "--build_tag_filters=-integration-test"
-      - "--action_env=GCO_ENABLED=1"
+      - "--action_env=CGO_ENABLED=1"
     test_targets:
       - "--"
       - "..."