Patch to fix isort issue in pre-commit

[davidorme]

Description

Something about poetry has resulted in changes to isort that broke a bunch of things. The newest version fixes those and so this PR just updates our pre-commit, pyproject.toml and poetry.lock to isort 5.12.0.

See here:

PyCQA/isort#2083

Type of change

• New feature (non-breaking change which adds functionality)
• Optimization (back-end change that speeds up the code)
• Bug fix (non-breaking change which fixes an issue)

Key checklist

• Make sure you've run the pre-commit checks: $ pre-commit run -a
• All tests pass: $ poetry run pytest

Further checks

• Code is commented, particularly in hard-to-understand areas
• Tests added that prove fix is effective or that feature works

[jacobcook1995]

LGTM!