chore(ci): grant pull-requests write to issue labeler workflow

Labeling pull requests requires pull-requests: write, not just issues: write.
Regression from #9058 when GH_TOKEN was replaced with scoped GITHUB_TOKEN.

Author: mikehardy

.github/workflows/issue-labels.yaml

@@ -6,6 +6,7 @@ on:
 
 permissions:
   issues: write
+  pull-requests: write
 
 jobs:
   label-op-response: