Bump pyflakes from 2.1.0 to 2.1.1 in /requirements
Bump pyflakes from 2.1.0 to 2.1.1 in /requirements

Bumps [pyflakes](https://github.com/PyCQA/pyflakes) from 2.1.0 to 2.1.1.
- [Release notes](https://github.com/PyCQA/pyflakes/releases)
- [Changelog](https://github.com/PyCQA/pyflakes/blob/2.1.1/NEWS.rst)
- [Commits](https://github.com/PyCQA/pyflakes/compare/2.1.0...2.1.1)

Signed-off-by: dependabot[bot] <5bdcd3c0d4d24ae3e71b3b452a024c6324c7e4bb@dependabot.com>
KWierso/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,edmorley/treeherder,edmorley/treeherder,KWierso/treeherder,KWierso/treeherder