chore(toolchain): use 20251028 release

[aignas]

Just an update to use the latest release.

[gemini-code-assist]

Summary of Changes

Hello @aignas, 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 maintaining the project's toolchain by updating the Python distributions to the most recent 20251028 release. This ensures that the project benefits from the latest improvements and security patches available in the Python ecosystem. The changes involve updating the source URLs and their corresponding cryptographic hashes for all specified Python versions, guaranteeing the integrity of the fetched binaries.

Highlights

• Python Toolchain Update: The Python toolchain has been updated to utilize the latest 20251028 release from the astral-sh/python-build-standalone repository.
• Checksum Refresh: All SHA256 checksums for supported Python versions (3.9.24, 3.10.19, 3.11.14, 3.12.12, 3.13.9, 3.14.0, and 3.15.0a1) across various platforms have been updated to reflect the new release artifacts.

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[gemini-code-assist]

Code Review

This pull request updates the Python toolchain to use the 20251028 release from python-build-standalone. The changes involve updating the download URLs and SHA256 hashes for various Python versions in python/versions.bzl, and adding a corresponding entry to CHANGELOG.md. The changes are straightforward. I have one suggestion to improve the maintainability of python/versions.bzl by avoiding hardcoded, repeated release dates in the URL strings.