ref: upgrade isort to work around poetry breakage (#3668)

python-poetry/poetry-core#542

Committed via https://github.com/asottile/all-repos

Author: asottile-sentry

.pre-commit-config.yaml

@@ -28,7 +28,7 @@ repos:
       - id: flake8
         language_version: python3.8
   - repo: https://github.com/pycqa/isort
-    rev: 5.10.1
+    rev: 5.12.0
     hooks:
       - id: isort
         name: isort (python)