Bump isort from 4.3.21 to 5.7.0

Bumps [isort](https://github.com/pycqa/isort) from 4.3.21 to 5.7.0.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/develop/CHANGELOG.md)
- [Commits](PyCQA/isort@4.3.21...5.7.0)

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

requirements/lint.txt

@@ -109,7 +109,7 @@ iniconfig==1.1.1
     # via
     #   -r requirements/tests.txt
     #   pytest
-isort==4.3.21
+isort==5.7.0
     # via pylint
 jinja2==2.11.2
     # via