Bump isort from 5.12.0 to 5.13.2 in /requirements

Bumps [isort](https://github.com/pycqa/isort) from 5.12.0 to 5.13.2.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/main/CHANGELOG.md)
- [Commits](PyCQA/isort@5.12.0...5.13.2)

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

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

requirements/test.txt

@@ -3,7 +3,7 @@ black==23.1.0;python_version>='3.7'
 flake8<5.0.4;python_version<'3.8'
 flake8==7.0.0;python_version>='3.8'
 isort<5.12.0;python_version<'3.8'
-isort==5.12.0;python_version>='3.8'
+isort==5.13.2;python_version>='3.8'
 mock==5.1.0;python_version>='3.6'
 pylint<2.16.2;python_version=='3.6' # pyup: ignore
 pylint==2.17.4;python_version>='3.7'