build(deps-dev): bump tox from 4.18.0 to 4.20.0

Bumps [tox](https://github.com/tox-dev/tox) from 4.18.0 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@4.18.0...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]>

Author: dependabot[bot]

poetry.lock

@@ -30,7 +30,7 @@ mypy = "^1.4.0"
 coverage = "^7.6.0"
 pytest = "^8.3.3"
 pytest-asyncio = "^0.24.0"
-tox = "^4.16.0"
+tox = "^4.20.0"
 pytest-httpserver = "^1.0.8"
 ruff = "^0"