fix: update pull_request event types in publish workflow

Author: jakemhiller

.github/workflows/publish.yml

@@ -5,7 +5,7 @@ on:
     branches:
       - main
   pull_request:
-    on: [opened, synchronize, reopened, labeled, unlabeled]
+    types: [opened, synchronize, reopened, labeled, unlabeled]
 
 permissions:
   id-token: write