Bump pre-commit-hooks to v4.1.0

Update pre-commit-hooks from v2.4.0 to v4.1.0:

https://github.com/pre-commit/pre-commit-hooks/releases

Since flake8 was removed in v4.0.0:

https://github.com/pre-commit/pre-commit-hooks/releases/tag/v4.0.0
https://github.com/pre-commit/pre-commit-hooks/pull/597

replace it with PyCQA/flake8:

https://github.com/PyCQA/flake8
https://flake8.pycqa.org/en/latest/release-notes/index.html

and address flake8 W605 issues detected by the new flake8:

https://www.flake8rules.com/rules/W605.html

Change-Id: I148b1b862b192a3e44c9ee90292df7678629d8e0
Signed-off-by: Sangwook Ha <sangwook.ha@verizon.com>