Fix Credentials issue while commit

[tarun-google]

Fix build_release_candidate failure for pushing the commit in build_release_candidate_job
https://github.com/apache/beam/actions/runs/17675934074/job/50237906459

GitHub Actions Tests Status (on master branch)

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[gemini-code-assist]

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[github-actions]

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[github-actions]

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[tarun-google]

Also, need help to trigger this workflow on apache-beam and verify PR is generated properly.

gh workflow run build_release_candidate.yml -f RELEASE='2.68.0' -f RC='1' -f REPO_TOKEN='' -f STAGE='{"managed_io_docs_pr":"yes"}'

[damccorm]

Thanks! I tried this and it worked, producing #36504