Update tox requirement from <3.25,>=3.17 to >=3.17,<3.26

Updates the requirements on [tox](https://github.com/tox-dev/tox) to permit the latest version.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/master/docs/changelog.rst)
- [Commits](tox-dev/tox@3.17.0...3.25.0)

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

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

setup.py

@@ -14,7 +14,7 @@
     'sorl-thumbnail',
     'factory-boy>=3.2,<3.3',
     'coverage>=5.5,<6.4',
-    'tox>=3.17,<3.25',
+    'tox>=3.17,<3.26',
 ]