Add pyi and cython file support to .pre-commit-hooks.yaml
Add pyi and cython file support to .pre-commit-hooks.yaml

Since pre-commit 2.9.0 (2020-11-21), the types_or key can be used to
match multiple disparate file types. For more upstream details, see:
https://github.com/pre-commit/pre-commit/issues/607

Fixes #402

PyCQA/isort,PyCQA/isort