feat(storage): drop Python 3.7-3.9 support and regenerate

[chalmerlowe]

Updates post processing to account for dropping support for Python 3.7, 3.8, 3.9 and the impacts that has on using 3.10 for lower bounds testing.

Changes

• updates the lower bound versions for several libraries to avoid conflicts and install issues in both setup.py and constraints-3.10.txt
• updates post-processing scripts to ensure the above updates persist

[gemini-code-assist]

Code Review

This pull request drops support for Python 3.9 across the google-cloud-storage package, updating setup.py, noxfile.py, and package metadata to reflect a minimum requirement of Python 3.10. The changes include updating dependency constraints, removing legacy compatibility logic for older Python versions, and advancing copyright headers to 2026. Review feedback suggests using flexible regex patterns instead of hardcoded versions in the librarian post-processing configuration to ensure robust replacement logic. Additionally, the removal of the warnings-as-errors flag in the documentation build was flagged as a change that should be applied consistently across the repository rather than in an individual package.