Update isort requirement from <=5.9.0,>=5.5.2 to >=5.5.2,<5.10.0

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@5.5.2...5.9.1)

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

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

requirements.txt

@@ -5,7 +5,7 @@ click>=7.1.2
 consolekit>=1.0.0
 dom-toml>=0.4.0
 domdf-python-tools>=2.5.0
-isort<=5.9.0,>=5.5.2
+isort>=5.5.2,<5.10.0
 prettyprinter>=0.18.0
 typing-extensions>=3.7.4.3
 yapf<0.32.0,>=0.30.0