Bump workflow helpers to v0.8.0 (#1299)

Signed-off-by: Francesco Murdaca <[email protected]>

Author: Francesco Murdaca

core/overlays/cnv-prod/common/imagestreamtags.yaml

@@ -21,7 +21,7 @@ spec:
   - name: latest
     from:
       kind: DockerImage
-      name: quay.io/thoth-station/workflow-helpers:v0.7.1
+      name: quay.io/thoth-station/workflow-helpers:v0.8.0
     importPolicy: {}
     referencePolicy:
       type: Local