Bump isort from 5.11.4 to 5.12.0 in /requirements

Bumps [isort](https://github.com/pycqa/isort) from 5.11.4 to 5.12.0.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/main/CHANGELOG.md)
- [Commits](PyCQA/isort@5.11.4...5.12.0)

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

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

Author: dependabot[bot]

requirements/dev-requirements.txt

@@ -13,7 +13,7 @@ dodgy==0.2.1  # Look for uploaded secrets
 flake8==6.0.0  # Lint
 freezegun==1.2.2
 furo==2022.12.7
-isort==5.11.4  # Lint imports
+isort==5.12.0  # Lint imports
 mypy==1.0.0  # Type checking
 pip_check_reqs==2.4.3
 pydocstyle==6.2.3  # Lint docstrings