Update tox requirement from >=3.9.0 to >=4.25.0

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/main/docs/changelog.rst)
- [Commits](tox-dev/tox@4.25.0...4.25.0)

---
updated-dependencies:
- dependency-name: tox
  dependency-version: 4.25.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

test-requirements.txt

@@ -1,6 +1,6 @@
 pytest >= 8.3.5
 pytest-cov >= 2.8.1
-tox >= 3.9.0
+tox >= 4.25.0
 flake8 >= 4.0.0
 types-python-dateutil >= 2.8.19.14
 mypy >= 1.5