ci: update Python versions, drop EOL 3.8/3.9, add 3.14

[wenh06]

Summary

• Drop EOL Python 3.8 and 3.9 from CI matrices
• Add Python 3.13 and 3.14 where missing
• Update requires-python to >=3.10 and refresh classifiers
• Update docs-publish.yml from Python 3.9 to 3.12

[Copilot]

Pull request overview

This PR updates the project’s declared Python support and GitHub Actions CI matrices to align with newer Python versions, removing EOL versions and adding coverage for newer interpreters.

Changes:

• Bump package requires-python to >=3.10 and refresh Trove classifiers (dropping 3.6–3.9, adding 3.14).
• Update CI test/formatting workflow matrices to drop Python 3.8/3.9 and add Python 3.13/3.14.
• Update the docs publish workflow to run on Python 3.12 instead of 3.9.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
pyproject.toml	Raises minimum supported Python to 3.10 and updates classifiers to match supported versions.
.github/workflows/run-pytest.yml	Updates pytest CI matrix to test 3.10–3.14.
.github/workflows/random-test.yml	Updates random-test CI matrix to test 3.10–3.14.
.github/workflows/docs-publish.yml	Moves docs build/publish job from Python 3.9 to 3.12.
.github/workflows/check-formatting.yml	Expands formatting matrix to include 3.13 and 3.14.

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