python-package: release v2.0.3

[aspeddro]

Changelog

#1785 — Add billing_project_id to Storage interactions

Adds a billing_project_id to the client that makes requests to buckets with the requester-pays policy enabled. When this policy is active, the client must specify a project for billing purposes.

#1782 — Improve errors

Improves error handling and error messages across the package.

#1778 — Update pyproject.toml, add license and readme

Fills out pyproject.toml with package metadata, adds a LICENSE file, and adds a README.md for the package.

#1777 — Fix Backend class

Bug fixes for the Backend class.

#1775 — Remove show_warnings and setup.py

Removes the deprecated show_warnings function and the legacy setup.py file.

#1773 — Documentation

• Removes mkdocs and the docs/ folder
• Updates docstrings for various functions and methods
• Removes the deploy-docs workflow
• Adds a gendoc.py script to generate markdown for the website repo

#1770 — Migrate to uv

Migrates the package toolchain from the previous package manager to uv.