Add pyi file support to .pre-commit-hooks.yaml (#1875)

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

Add the minimum_pre_commit_version to require pre-commit 2.9.0+.

Fixes #402