Bump pytest-flake8 from 1.0.7 to 1.1.1

Bumps [pytest-flake8](https://github.com/tholo/pytest-flake8) from 1.0.7 to 1.1.1.
- [Release notes](https://github.com/tholo/pytest-flake8/releases)
- [Changelog](https://github.com/tholo/pytest-flake8/blob/master/CHANGELOG)
- [Commits](tholo/pytest-flake8@1.0.7...1.1.1)

---
updated-dependencies:
- dependency-name: pytest-flake8
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements/dev.txt

@@ -2,7 +2,7 @@
 black==21.10b0
 pytest==6.2.5
 pytest-django==4.4.0
-pytest-flake8==1.0.7
+pytest-flake8==1.1.1
 flake8==3.9.2
 django-debug-toolbar==3.2.2
 pytest-mock==3.7.0