Update tox requirement from ==4.26.* to ==4.29.*

Updates the requirements on [tox](https://github.com/tox-dev/tox) to permit the latest version.
- [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@4.26.0...4.29.0)

---
updated-dependencies:
- dependency-name: tox
  dependency-version: 4.29.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-test.txt

@@ -1,4 +1,4 @@
 coverage == 7.8.*
 mypy == 1.16.*
 pre-commit == 4.2.*
-tox == 4.26.*
+tox == 4.29.*