Update isort to 5.11.5

[cdce8p]

Release notes: https://github.com/PyCQA/isort/releases/tag/5.11.5

This resolves an issue with pre-commit and poetry which caused the pre-commit isort install to fail.

Edit: 5.12.0 requires Python 3.8

[JelleZijlstra]

I could get behind upgrading to 5.12.0 and documenting that you need a newer Python version to run it, but if 5.11.5 solves the problem we can just stick with it for now. 3.7 will go EOL in a few months and presumably we'll drop mypy support soon after.

[cdce8p]

I could get behind upgrading to 5.12.0 and documenting that you need a newer Python version to run it, but if 5.11.5 solves the problem we can just stick with it for now. 3.7 will go EOL in a few months and presumably we'll drop mypy support soon after.

We don't use pre-commit for the CI runs (yet) and the tox environment for lint still uses Python 3.7.

mypy/.github/workflows/test.yml

Lines 96 to 100 in c03e979

	- name: Formatting with Black + isort and code style with flake8
	python: '3.7'
	arch: x64
	os: ubuntu-latest
	toxenv: lint

Although it isn't difficult to change it to 3.8, let's stick with 5.11.5 for now. That's just a hotfix for the pre-commit / poetry issue.

[github-actions]

According to mypy_primer, this change has no effect on the checked open source code. 🤖🎉