Update expired workflow images in manifest-staging

Change-Id: If5eb851afbe0a0589c0c1ef34fce4c557ad38baa
Issue-ID: INT-1052
Signed-off-by: Yang Xu <yang.xu3@huawei.com>
diff --git a/version-manifest/src/main/resources/docker-manifest-staging.csv b/version-manifest/src/main/resources/docker-manifest-staging.csv
index 88d91d3..42979ea 100644
--- a/version-manifest/src/main/resources/docker-manifest-staging.csv
+++ b/version-manifest/src/main/resources/docker-manifest-staging.csv
@@ -164,6 +164,6 @@
 onap/vnfsdk/refrepo,1.2.0
 onap/vnfsdk/refrepo/postgres,1.2.0
 onap/vnfsdk/vnftest,1.1.0
-onap/workflow-backend,1.4.0-SNAPSHOT
-onap/workflow-frontend,1.4.0-SNAPSHOT
-onap/workflow-init,1.4.0-SNAPSHOT
+onap/workflow-backend,latest
+onap/workflow-frontend,latest
+onap/workflow-init,latest