* Current flake8 no longer accepts comments on config lines

`ValueError: Error code '#' supplied to 'extend-ignore' option does not match '^[A-Z]{1,3}[0-9]{0,3}$'`

* flake8==6.0.0

* Update .flake8

* Update setup.py

Co-authored-by: Stephen Roller <roller@fb.com>

Co-authored-by: Stephen Roller <roller@fb.com>