Update publish.yaml (#2465)

- update permissions for the publish workflow

Author: devoncarew

.github/workflows/publish.yaml

@@ -15,3 +15,6 @@ jobs:
     uses: dart-lang/ecosystem/.github/workflows/publish.yaml@main
     with:
       write-comments: false
+    permissions:
+      id-token: write
+      pull-requests: write