crcmod-plus

chore: drop support for Python 3.7 and 3.8 as they are EOL

chore: fix format of pyproject.toml so it is okay for setuptools

chore: clarify MIT license, add Python 3.12 and 3.13 to tox test matrix

ci: allow pre-release versions of Python

ci: add Python 3.14 and free-threaded variants