fix(ci): use GITHUB_TOKEN for sync-llm-info PR creation

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This pull request was authored by a coding agent.

📝 Summary

The weekly Sync LLM models workflow has failed on every run since it was added (#9724). Sync, codegen, tests, commit, and push all succeed, but gh pr create fails with:

Resource not accessible by integration (createPullRequest)

The release GitHub App token has contents: write (enough to push automation/sync-llm-info-models) but not pull-requests: write. I switched the PR lookup and creation steps to GITHUB_TOKEN, which the workflow already grants pull-requests: write. The app token is still used for checkout and push.

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✅ Merge Checklist

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• Tests have been added for the changes made.

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Project	Deployment	Actions	Updated (UTC)
marimo-docs	Ready	Preview, Comment	Jun 26, 2026 5:56am

[cubic-dev-ai]

No issues found across 1 file

_{Re-trigger cubic}

[github-actions]

🚀 Development release published. You may be able to view the changes at https://marimo.app?v=0.23.12-dev4