build(deps-dev): update isort requirement from <5.14,>5 to >5,<6.1

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@5.0.1...6.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

dev-requirements.txt

@@ -1,6 +1,6 @@
 tox < 3.29  # until tox-pyenv is updated for tox 4.x
 tox-pyenv < 1.2
-isort > 5, < 5.14
+isort > 5, < 6.1
 build < 1.2.3
 autoflake < 2.4
 auto-walrus