⬆ Bump flake8-simplify from 0.19.3 to 0.21.0

Bumps [flake8-simplify](https://github.com/MartinThoma/flake8-simplify) from 0.19.3 to 0.21.0.
- [Release notes](https://github.com/MartinThoma/flake8-simplify/releases)
- [Changelog](https://github.com/MartinThoma/flake8-simplify/blob/main/CHANGELOG.md)
- [Commits](MartinThoma/flake8-simplify@0.19.3...0.21.0)

---
updated-dependencies:
- dependency-name: flake8-simplify
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements/lint-requirements.txt

@@ -5,7 +5,7 @@ flake8==5.0.4
 flake8-bugbear==22.10.25
 flake8-comprehensions==3.10.0
 flake8-docstrings==1.6.0
-flake8-simplify==0.19.3
+flake8-simplify==0.21.0
 flake8-tidy-imports==4.8.0
 isort==5.10.1
 pyupgrade==3.1.0