Update dependency tox to v4.29.0

Author: renovate[bot]

pyproject.toml

@@ -29,7 +29,7 @@ dev = [
     "flake8==7.3.0",
     "werkzeug==3.1.3",
     "pytest-httpserver==1.1.3",
-    "tox==4.28.4",
+    "tox==4.29.0",
     "pytest-cov==6.2.1",
     "types-requests>=2.32.0,<3",
     "isort==6.0.1",