Update tox requirement from ~=4.8 to ~=4.9

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@4.8.0...4.9.0)

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

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

dev-requirements.txt

@@ -22,7 +22,7 @@ pytest-dotenv~=0.5.2
 pytest-logbook~=1.2
 pytest-xdist~=3.3
 pytz~=2023.3
-tox~=4.8
+tox~=4.9
 types-pytz~=2023.3
 types-requests~=2.31
 twine~=4.0