chore(librarian): temporarily bump nox session timeout to 20 minutes

[parthea]

This PR is needed to help debug the issue in 14992.

Towards #14992

[gemini-code-assist]

Summary of Changes

Hello @parthea, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request implements a temporary adjustment to the librarian tool by doubling the timeout duration for Nox sessions from 10 to 20 minutes. This change is specifically aimed at providing more time for debugging efforts related to issue #14992, ensuring that diagnostic runs are not cut short due to timeout constraints.

Highlights

• Nox Session Timeout Increase: The timeout for Nox sessions executed via subprocess.run has been temporarily increased from 10 minutes (600 seconds) to 20 minutes (1200 seconds).
• Debugging Aid: This change is a temporary measure intended to assist in debugging issue library generation fails for 3 libraries #14992, allowing longer-running Nox processes to complete without premature termination.

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[gemini-code-assist]

Code Review

This pull request temporarily increases the nox session timeout to 20 minutes to help with debugging an issue. The change is straightforward, but to ensure this temporary modification isn't overlooked and made permanent, I've suggested adding a TODO comment. This will provide context for future developers and serve as a reminder to revert the change once debugging is complete.