Bump isort from 5.5.3 to 5.5.4

Bumps [isort](https://github.com/pycqa/isort) from 5.5.3 to 5.5.4.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@5.5.3...5.5.4)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

dev-requirements.txt

@@ -13,7 +13,7 @@ flake8-commas==2.0.0  # Require silicon valley commas
 flake8-quotes==3.2.0  # Require single quotes
 flake8==3.8.3  # Lint
 freezegun==1.0.0  # Freeze time in tests
-isort==5.5.3  # Lint imports
+isort==5.5.4  # Lint imports
 keyring==21.4.0
 mypy==0.782 # Type checking
 pip_check_reqs==2.1.1