chore(deps-dev): bump flake8-bugbear from 21.4.3 to 21.9.1

Bumps [flake8-bugbear](https://github.com/PyCQA/flake8-bugbear) from 21.4.3 to 21.9.1.
- [Release notes](https://github.com/PyCQA/flake8-bugbear/releases)
- [Commits](PyCQA/flake8-bugbear@21.4.3...21.9.1)

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

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

Author: dependabot[bot]

Diff for: poetry.lock

@@ -49,7 +49,7 @@ bandit = "^1.7.0"
 radon = "^5.1.0"
 xenon = "^0.8.0"
 flake8-eradicate = "^1.1.0"
-flake8-bugbear = "^21.3.2"
+flake8-bugbear = "^21.9.1"
 mkdocs-material = "^7.2.6"
 mkdocs-git-revision-date-plugin = "^0.3.1"
 mike = "^0.6.0"