Updates the workflow to use the new labels (#581)

* Updates the workflow to use the new labels

* Corrects case

Author: nickfloyd

.github/workflows/update.yml

@@ -86,4 +86,4 @@ jobs:
           branch: openapi-update
           commit-message: WIP octokit/openapi updated
           author: Octokit Bot <33075676+octokitbot@users.noreply.github.com>
-          labels: maintenance
+          labels: "Type: Maintenance"