Bump pre-commit isort to 5.12.0

This release contains a critical fix for newer Poetry versions that
crashes due to "invalid" pyproject.toml syntax.

Author: uranusjr

.pre-commit-config.yaml

@@ -33,7 +33,7 @@ repos:
     exclude: tests/data
 
 - repo: https://github.com/PyCQA/isort
-  rev: 5.10.1
+  rev: 5.12.0
   hooks:
   - id: isort
     files: \.py$