Bump tox from 4.12.1 to 4.13.0 (#368)

Bumps [tox](https://github.com/tox-dev/tox) from 4.12.1 to 4.13.0.
- [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@4.12.1...4.13.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements_testing.txt

@@ -6,6 +6,6 @@ pytest-cov==4.1.0
 pytest-icdiff==0.9
 ruff==0.2.1
 setuptools==69.1.0
-tox==4.12.1
+tox==4.13.0
 tox-gh-actions==3.2.0
 mypy==1.8.0