Bump tox from 4.6.1 to 4.6.3

Bumps [tox](https://github.com/tox-dev/tox) from 4.6.1 to 4.6.3.
- [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@4.6.1...4.6.3)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

requirements/tox.txt

@@ -2,4 +2,4 @@
 
 tox==3.14.0;python_version<="2.7"
 tox==3.28.0;python_version<="3.6" and python_version>"2.7"
-tox==4.6.1;python_version>="3.7"
+tox==4.6.3;python_version>="3.7"