Bump tox from 4.5.1 to 4.6.4

Bumps [tox](https://github.com/tox-dev/tox) from 4.5.1 to 4.6.4.
- [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@4.5.1...4.6.4)

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

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

requirements/requirements-test.lock.txt

@@ -158,12 +158,12 @@ pbr==5.11.1
     # via stevedore
 pkginfo==1.9.6
     # via twine
-platformdirs==3.6.0
+platformdirs==3.8.0
     # via
     #   pylint
     #   tox
     #   virtualenv
-pluggy==1.0.0
+pluggy==1.2.0
     # via
     #   pytest
     #   tox
@@ -261,7 +261,7 @@ tomlkit==0.11.8
     # via pylint
 tornado==6.3.2
     # via livereload
-tox==4.6.3
+tox==4.6.4
     # via -r requirements/requirements-test.in
 twine==4.0.2
     # via -r requirements/requirements-test.in