Fix/update pre commit config

[TomAugspurger]

This updates the pre-commit config to match Dask's (minus isort, which wasn't previously used here).

This fixes an issue I saw locally with the "language_version" and a conda env:

An unexpected error has occurred: CalledProcessError: command: ('/home/taugspurger/miniconda3/envs/dask-gateway/bin/python3.8', '-mvirtualenv', '/home/taugspurger/.cache/pre-commit/repoi452dik9/py_env-python3.7', '-p', 'python3.7')
return code: 1
expected return code: 0
stdout:
    RuntimeError: failed to find interpreter for Builtin discover of python_spec='python3.7'