Update dependency isort to v6 (#821)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

setup.cfg

@@ -57,7 +57,7 @@ install_requires =
 dev =
     black~=24.4.0
     build~=1.2.1
-    isort~=5.13.0
+    isort~=6.0.0
     types-pytz~=2024.2.0.20241221
     pre-commit~=3.8.0
     pytest-cases~=3.8.0