Pre-install mypy deps in `pre-commit.ci` (#666)
Pre-install mypy deps in `pre-commit.ci` (#666)

Co-authored-by: Abhinav Singh <4144cc367d203d56e7fae38755ab79a2b0e68306@gmail.com>
abhinavsingh/proxy.py,abhinavsingh/proxy.py,abhinavsingh/proxy.py,abhinavsingh/proxy.py,abhinavsingh/proxy.py,abhinavsingh/proxy.py