chore(CI): correct permissions for issue labeler

[chenjiahan]

Summary

Since the pr-labeler workflow adds labels to pull requests, it needs the pull-requests: write permission.

Related Links

https://docs.github.com/en/actions/writing-workflows/choosing-what-your-workflow-does/controlling-permissions-for-github_token#overview

Checklist

• Tests updated (or not required).
• Documentation updated (or not required).

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