Pre-alpha release 0.3.0

Changed

• Set minimum Python 3.9 (#36)
• Updated cibuildwheel workflow, build macos arm64 wheels from GHA (#30, #32)
• Fix finder.load() for conda and LD path search
• Fix typos (#37)
• Use ruff format, apply ruff check rules, add pre-commit (#38, #45)

Fixed

• Fix in mod2obs_mf6 with different depvar names (#33)

Full Changelog: v0.2.1...v0.3.0