Python 3.8 no longer supported; EOL was 2024-10-07

[pda]

Python 3.8 EOL was 2024-10-07, so remove support.
Python 3.9 will EOL in a couple of months and will also be removed then.

Related:

• https://devguide.python.org/versions/#versions
• https://peps.python.org/pep-0569/

[Copilot]

Pull Request Overview

This PR removes support for Python 3.8 following its end-of-life date of 2024-10-07, updating the minimum supported Python version to 3.9. The changes also add Python 3.13 support to the GitHub Actions testing matrix.

• Updated minimum Python version requirement from 3.8 to 3.9
• Added Python 3.13 to the CI testing matrix
• Updated documentation to reflect the new minimum version requirement

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated no comments.

File	Description
pyproject.toml	Updated requires-python field to enforce minimum Python 3.9
README.md	Updated documentation to reflect new minimum Python version
.github/workflows/python.yaml	Removed Python 3.8 and added Python 3.13 to CI test matrix

[gchan]

Do we have any statistics on Python language version usage?

I don't believe the Python collector sends through the Python language version to Test Engine as a 'language_version' env var.

e.g. Ruby Collector - https://github.com/buildkite/test-collector-ruby/blob/6f3b5e1785fc025ec604b02e699338bf7bf59d66/lib/buildkite/test_collector/ci.rb#L40

[pda]

I don't believe the Python collector sends through the Python language version to Test Engine as a 'language_version' env var.

Ah that's a shame, we should fix that!

[gchan]

I don't believe the Python collector sends through the Python language version to Test Engine as a 'language_version' env var.

Ah that's a shame, we should fix that!

Working on it!

[gchan]

#67