fix(coverage): bump coverage.py to 7.10.7 for Python 3.14 support

[slaptijack]

Why

rules_python coverage support needs to work on Python 3.14, but we also need
to keep Python 3.9 compatibility for users not yet on newer runtimes.

What changed

• Bumped coverage.py wheel set to 7.10.7 in python/private/coverage_deps.bzl.
• Updated tools/private/update_deps/update_coverage_deps.py so regenerated
  coverage deps correctly include:
  • cp314 by default
  • wheel platform tags used by newer coverage releases (including freethreaded variants).
• Kept coverage import-shadowing behavior via python/private/coverage.patch,
  but narrowed patch context so it applies reliably across newer coverage wheel layouts.
• Added an Unreleased changelog entry in CHANGELOG.md.

Before

• Python 3.14 coverage support required a newer coverage version, but newer
  versions dropped Python 3.9 support.
• The update script/platform mapping was stale for newer wheel tags.
• Patch application was brittle across coverage versions due to wide context.

After

• Coverage uses 7.10.7, which supports both Python 3.9 and Python 3.14.
• Update script can regenerate coverage deps for current wheel tag variants.
• Coverage patch applies robustly while preserving existing behavior.

Testing

• bazel test //tests/python:python_tests //tests/py_runtime:py_runtime_tests --test_tag_filters=-integration-test
• Verified Python 3.14 bazel coverage end-to-end in a minimal repro workspace
  using this branch via local_path_override.

[gemini-code-assist]

Summary of Changes

Hello @slaptijack, 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 addresses the need for rules_python coverage support on Python 3.14 while maintaining backward compatibility with Python 3.9. The changes involve upgrading the coverage.py library to a version that supports the required Python range, updating the dependency management tooling to correctly generate wheels for new Python versions and platform tags, and making a critical patch more resilient to future coverage.py updates. This ensures a seamless and robust coverage experience across diverse Python environments.

Highlights

• Coverage.py Update: Updated coverage.py to version 7.10.7, ensuring compatibility with both Python 3.9 and Python 3.14.
• Dependency Update Script Enhancement: Enhanced the coverage dependency update script to correctly include cp314 and support newer wheel platform tags, including freethreaded variants.
• Patch Refinement: Refined the coverage.patch to narrow its context, making it more robust and reliable across different coverage.py versions.
• Changelog Entry: Added a new entry to CHANGELOG.md documenting the coverage update.

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Changelog

• CHANGELOG.md
  • Added a changelog entry for the coverage update, specifically noting support for Python 3.14 while retaining Python 3.9 compatibility.

Activity

• No human activity has been recorded on this pull request yet.

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[gemini-code-assist]

Code Review

This pull request updates coverage.py to version 7.10.7 to add support for Python 3.14. The changes include updating dependency definitions, modifying the patch file for better compatibility, and updating the dependency generation script. My review found an issue in the update script where it retains support for Python 3.8, which is no longer supported by the new coverage.py version, causing the script to fail. A fix has been suggested.