[FIX] Replace pkg_resources version parsing

[Mirochill]

This PR...

• replaces pkg_resources.parse_version() with packaging.version.parse
• declares packaging for package installs, conda envs, and the pylint workflow

Fixes #295.

Considerations and implementations

pkg_resources is no longer available with recent setuptools releases, so the runtime import in wahoomc/setup_functions.py prevents the CLI from starting. packaging.version.parse provides the version comparison behavior needed here without depending on pkg_resources.

How to test

Not run locally.

Static validation performed:

• git diff --check
• git diff --check HEAD~1..HEAD
• rg -n pkg_resources|parse_version|packaging wahoomc tests setup.cfg pyproject.toml conda_env .github

Pull Request Checklist

• Reviewed the Contributing Guidelines
• Commits (and commit-messages) are understandable
• Tested with macOS / Linux
• Tested with Windows