gsutil does not work with Python 3.14

Thank you very much for this amazing project. It is a great help to my daily work.

Today my distribution, Arch Linux, received Python 3.14, which breaks `gsutil`.

I'd like to suggest removing the upper version limit entirely. This would allow
users to benefit from new Python versions immediately. If compatibility issues
arise, users can easily downgrade to an older Python version themselves, rather
than being blocked preemptively for everyone.

Thank you very much.

Start by locating gsutil's Python version upper bound in its packaging or compatibility configuration, then inspect how that constraint is enforced. Verify that Python 3.14 is accepted and check the existing compatibility checks or installation flow for regressions. Done means gsutil no longer blocks Python 3.14 solely because of the upper version limit.

Written by the indexing model from the issue text.