build(deps): update tox requirement from >=3.9.0 to >=4.60.0

[dependabot]

Updates the requirements on tox to permit the latest version.

Release notes

Sourced from tox's releases.

v4.60.0

What's Changed

• 📄 docs: publish llms.txt from the docs build by @​gaborbernat in tox-dev/tox#4023
• Provision before loading env_list by @​CAOShurong in tox-dev/tox#4022
• docs: repoint nine dead source links in the onboarding guide by @​Yusuf-Gadelrab in tox-dev/tox#4025
• Add {home} and {tox_root_name} substitutions by @​WhyNotHugo in tox-dev/tox#4020

New Contributors

• @​CAOShurong made their first contribution in tox-dev/tox#4022
• @​Yusuf-Gadelrab made their first contribution in tox-dev/tox#4025
• @​WhyNotHugo made their first contribution in tox-dev/tox#4020

Full Changelog: tox-dev/tox@4.59.0...4.60.0

Changelog

Sourced from tox's changelog.

Features - 4.60.0

• Add {home} and {tox_root_name} substitutions; set :ref:work_dir to e.g. "{home}/.local/state/tox/{tox_root_name}" to keep environments outside of the project tree - by :user:WhyNotHugo. (:issue:4020)

Bug fixes - 4.60.0

• Provision the requested tox version before reading env_list, allowing configuration syntax introduced by that version - by :user:CAOShurong (:issue:4021)

Improved documentation - 4.60.0

• Fix nine source-code links in the onboarding guide that pointed at paths which no longer exist, and correct the class names of the TOML configuration sources and loaders they refer to - by :user:Yusuf-Gadelrab. (:issue:4024)

---

v4.59.0 (2026-08-10)

---

Features - 4.59.0

• The plugin and internal APIs now declare their types, and the code base passes mypy --strict and pyrefly next to ty - by :user:gaborjbernat.

  • :meth:ConfigSet.get <tox.config.sets.ConfigSet.get> returns a configuration value after checking it against its declared type, so plugins can drop cast around conf["key"] reads.
  • The :func:tox_on_install <tox.plugin.spec.tox_on_install> hook and :class:Installer <tox.tox_env.installer.Installer> type their arguments as :data:InstallArguments <tox.tox_env.installer.InstallArguments>; installer subclasses may narrow it through the new second type parameter.
  • :class:Parsed <tox.config.cli.parser.Parsed> declares the CLI option surface, so options.<name> reads type-check.
  • :meth:ConfigSet.add_config <tox.config.sets.ConfigSet.add_config> accepts default=None for optional values and infers the value type from callable defaults.
  • The journal, the environment cache, and execute metadata hold JsonValue content; structured set_env entries match the SetEnvEntry shape. (:issue:4014)

Improved documentation - 4.59.0

• Mark the INI configuration format as deprecated throughout the documentation - by :user:gaborbernat.

  • The tutorial, the configuration reference, and the migration how-to state that INI keeps working for existing projects but is frozen and receives no new features.
  • Every INI example tab, the configuration discovery diagram, and the man page carry a deprecation marker.
  • The tutorial no longer suggests generating a tox.ini via tox quickstart. (:issue:4017)

... (truncated)

Commits

• 02977de release 4.60.0
• ec44803 Add {home} and {tox_root_name} substitutions (#4020)
• 4636193 docs: repoint nine dead source links in the onboarding guide (#4025)
• c3f8d22 Provision before loading env_list (#4022)
• a313922 📄 docs: publish llms.txt from the docs build (#4023)
• cb7eeca release 4.59.0
• da75cad 📝 docs: mark the INI configuration format as deprecated (#4017)
• ef7dc3a ✅ test: raise timeout for missing-interpreter discovery tests (#4018)
• c76344d [pre-commit.ci] pre-commit autoupdate (#4016)
• 7be33b8 ✨ feat(plugin): type the plugin and internal API surfaces (#4014)
• Additional commits viewable in compare view

[dependabot]

Superseded by #202.