DEV: maintenance

[GavinHuttley]

Summary by Sourcery

Update supported Python versions in CI and documentation to reflect current maintenance targets.

CI:

• Update test matrix to only include Python 3.10 and 3.13 in CI workflow.

Documentation:

• Update Python version badge in README to reflect supported versions.

[sourcery-ai]

Reviewer's Guide

This PR performs maintenance by updating the CI workflow to test only Python 3.10 and 3.13, and by replacing the static Python version badge in the README with a dynamic badge from PyPI.

File-Level Changes

Change	Details	Files
Updated CI workflow and Python version badge for maintenance.	Reduced tested Python versions in CI from 3.10, 3.11, 3.12, 3.13 to 3.10 and 3.13. Replaced hardcoded Python version badge in README with dynamic PyPI badge.	.github/workflows/testing_develop.yml README.md

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[sourcery-ai]

Hey @GavinHuttley - I've reviewed your changes and they look great!

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