Bump tox from 4.28.0 to 4.28.3 (#328)

Bumps [tox](https://github.com/tox-dev/tox) from 4.28.0 to 4.28.3.
- [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@4.28.0...4.28.3)

---
updated-dependencies:
- dependency-name: tox
  dependency-version: 4.28.3
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements-dev.txt

@@ -6,6 +6,6 @@ mypy==1.15.0
 pre-commit==4.2.0
 pygments==2.19.2
 pyupgrade==3.20.0
-tox==4.28.0
+tox==4.28.3
 types-requests==2.32.4.20250611
 types-setuptools==80.9.0.20250529