Bump tox from 3.25.0 to 3.25.1 (#176)

Bumps [tox](https://github.com/tox-dev/tox) from 3.25.0 to 3.25.1.
- [Release notes](https://github.com/tox-dev/tox/releases)
- [Changelog](https://github.com/tox-dev/tox/blob/master/docs/changelog.rst)
- [Commits](tox-dev/tox@3.25.0...3.25.1)

---
updated-dependencies:
- dependency-name: tox
  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

@@ -11,4 +11,4 @@ pytest-django==4.5.2
 sphinx==4.2.0
 sphinx-autobuild==2021.3.14
 sphinxcontrib_httpdomain==1.7.0
-tox==3.25.0
+tox==3.25.1