Update isort requirement from <5.14.0 to <6.1.0

Updates the requirements on [isort](https://github.com/pycqa/isort) to permit the latest version.
- [Release notes](https://github.com/pycqa/isort/releases)
- [Changelog](https://github.com/PyCQA/isort/blob/main/CHANGELOG.md)
- [Commits](PyCQA/isort@0.0.9...6.0.0)

---
updated-dependencies:
- dependency-name: isort
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements-dev.txt

@@ -6,6 +6,6 @@ pytest-asyncio<0.26.0
 pytest-cov<=6.0.0
 freezegun<1.6.0
 pyupgrade<3.20.0
-isort<5.14.0
+isort<6.1.0
 docformatter<1.7.6
 bandit<1.9.0