[WIP][CI] Upgrade CI to Python 3.10

[mshr-h]

Python 3.9 is EoL in 2025-10, so it's a good time to move to 3.10. Also, upgrade other dependencies.

refs:

• [CI] Upgrade CI to Python 3.9 #17425

[gemini-code-assist]

Summary of Changes

Hello @mshr-h, 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 focuses on modernizing the continuous integration pipeline by upgrading the Python version used in the CI environment to 3.10. This involves adjusting the build configuration and updating the associated dependency specifications to ensure compatibility and leverage newer language features.

Highlights

• CI Python Version Update: The CI bootstrapping script has been updated to specifically target Python 3.10, deprecating previous versions.
• Dependency Management: New dependency constraint files for Python 3.10 have been introduced, while older constraint and requirement files for Python 3.7, 3.8, and 3.9 have been removed.

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[gemini-code-assist]

Code Review

This pull request aims to upgrade the CI to Python 3.10 by updating the bootstrap script and its corresponding lockfiles. The changes are straightforward, but the newly generated constraints file constraints-3.10.txt has a duplicate entry for the pip package, which will cause installation failures. This seems to be caused by a flaw in the generate.sh script which appends dependencies that are already present. Additionally, many packages in constraints-3.10.txt are pinned to versions that do not appear to be publicly available on PyPI (e.g., certifi==2026.1.4, cffi==2.0.0). If this is unintentional, it will also lead to build failures.

[gemini-code-assist]

This line is a duplicate entry for the pip package, which is already specified on lines 442-444. This will cause errors during package installation. Please remove this duplicate line.

[tqchen]

cc @yongwww