Bump tox from 4.11.0 to 4.12.1

Bumps [tox](https://github.com/tox-dev/tox) from 4.11.0 to 4.12.1.
- [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@4.11.0...4.12.1)

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

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

setup.py

@@ -61,7 +61,7 @@
             # Setup.
             "pre-commit==3.6.0 ; python_version>='3.9'",
             "tox==3.27.1 ; python_version<'3.8'",
-            "tox==4.11.0 ; python_version>='3.8'",
+            "tox==4.12.1 ; python_version>='3.8'",
             # Testing framework.
             "pytest==6.1.2 ; python_version<'3.8'",
             "pytest==7.4.0 ; python_version>='3.8'",