chore(workflows): update the api

googleapiclient/discovery_cache/documents/workflows.v1beta.json

diff --git a/googleapiclient/discovery_cache/documents/workflows.v1beta.json b/googleapiclient/discovery_cache/documents/workflows.v1beta.json
index 7f58b33..c3b8ec0 100644
--- a/googleapiclient/discovery_cache/documents/workflows.v1beta.json
+++ b/googleapiclient/discovery_cache/documents/workflows.v1beta.json
@@ -444,7 +444,7 @@
       }
     }
   },
-  "revision": "20210506",
+  "revision": "20210513",
   "rootUrl": "https://workflows.googleapis.com/",
   "schemas": {
     "Empty": {