Bump tox from 4.21.2 to 4.23.0

Bumps [tox](https://github.com/tox-dev/tox) from 4.21.2 to 4.23.0.
- [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@4.21.2...4.23.0)

---
updated-dependencies:
- dependency-name: tox
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements_testing.txt

@@ -6,6 +6,6 @@ pytest-cov==5.0.0
 pytest-icdiff==0.9
 ruff==0.6.9
 setuptools==75.1.0
-tox==4.21.2
+tox==4.23.0
 tox-gh-actions==3.2.0
 mypy==1.12.0