Bump tox from 4.19.0 to 4.20.0 (#664)

Bumps [tox](https://github.com/tox-dev/tox) from 4.19.0 to 4.20.0.
- [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@4.19.0...4.20.0)

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

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

requirements-dev.txt

@@ -10,5 +10,5 @@ pytest-cov==5.0.0
 pytest==8.3.3
 pytest-asyncio==0.24.0
 isort==5.13.2
-tox==4.19.0
+tox==4.20.0
 wheel==0.44.0