Update CI matrix and documentation for supported Python versions

[harryswift01]

Summary

This PR will align the project’s CI configuration, documentation, and packaging metadata with the current Python support policy.

Changes

CI configuration updates:

• Updated project-ci.yaml to use a matrix strategy across multiple operating systems.
• Added testing for Python versions 3.12, 3.13, and 3.14.
• Removed reliance on a single Python version in CI.

Documentation updates:

• Updated getting_started.rst to reflect Python 3.12+ support.
• Removed outdated references to unsupported Python versions.

Packaging metadata cleanup:

• Removed the Python version classifier from pyproject.toml.
• Prevented implying unsupported Python version compatibility.

Impact

• Improves CI coverage across supported platforms and Python versions.
• Ensures documentation accurately reflects supported Python versions.
• Reduces confusion for users and contributors regarding Python compatibility.

[jimboid]

Any insight into why the pre-commit started failing for Windows builds? As far as I can tell, you didn't change anything there..

[harryswift01]

Any insight into why the pre-commit started failing for Windows builds? As far as I can tell, you didn't change anything there..

It wasn’t a change to pre-commit itself, the Windows CI runner runs commands in PowerShell by default, and the workflow was using Bash-specific syntax. That started failing on Windows even though Linux and macOS were fine. I’ve updated the step to explicitly run with Bash so it behaves the same on all platforms.

[jimboid]

Looks like it is all working the way it should. Deprecating py3.11 is a good idea if things are starting to become incompatible.