Fix typo.

limbo/limbo-pipeline.yaml

@@ -47,7 +47,7 @@ spec:
         - name: git-owner
           value: limbo
         - name: description
-          value: $(task.status)
+          value: $(tasks.status)
         - name: git-repo-name
           value: $(params.gitea-repo-name)
         - name: name