Migrate to modern pint (and therefore modern numpy)

[fxcoudert]

Summary

Major changes:

• fix 1: allow recent pint versions (and therefore numpy 2)

Checklist

• Google format doc strings added. Check with ruff.
• Type annotations included. Check with mypy.
• Tests added for new features/fixes.
• If applicable, new classes/functions/modules have duecredit @due.dcite decorators to reference relevant papers by DOI (example)

Tip: Install pre-commit hooks to auto-check types and linting before every commit:

pip install -U pre-commit
pre-commit install