deps: bump tox from 4.28.4 to 4.29.0 in the prod-deps group

[dependabot]

Bumps the prod-deps group with 1 update: tox.

Updates tox from 4.28.4 to 4.29.0

Release notes

Sourced from tox's releases.

4.29.0

What's Changed

• Docs: environment variables contain strings by @​hroncok in tox-dev/tox#3575
• 🐍 Fix sys_platform Fixture Leakage breaking the CI by @​gaborbernat in tox-dev/tox#3589
• Expose a new tox_extend_envs hook in plugins API by @​webknjaz in tox-dev/tox#3591

Full Changelog: tox-dev/tox@4.28.4...4.29.0

Changelog

Sourced from tox's changelog.

v4.29.0 (2025-08-29)

Features - 4.29.0

- A new tox life cycle event is now exposed for use via :doc:`Plugins
  API </plugins>` -- by :user:`webknjaz`.
The corresponding hook point is :func:tox_extend_envs &lt;tox.plugin.spec.tox_extend_envs&gt;. It allows plugin authors to
declare ephemeral environments that they can then populate through
the in-memory configuration loader interface.
This patch was made possible thanks to pair programming with
:user:gaborbernat at PyCon US 2025. (:issue:3510, :issue:3591)

Commits

• 59aaee9 release 4.29.0
• bf558e3 Expose a new tox_extend_envs hook in plugins API (#3591)
• eceba31 [pre-commit.ci] pre-commit autoupdate (#3587)
• 18d2943 Fix sys_platform patch in test suite leaking patching (#3589)
• 8088ecb Bump actions/checkout from 4 to 5 (#3582)
• c0b4118 [pre-commit.ci] pre-commit autoupdate (#3581)
• 1e06779 Bump actions/download-artifact from 4 to 5 (#3576)
• 7d4cb4e Docs: environment variables contain strings (#3575)
• 9930f8b [pre-commit.ci] pre-commit autoupdate (#3573)
• See full diff in compare view

Dependabot will resolve any conflicts with this PR as long as you don't alter it yourself. You can also trigger a rebase manually by commenting @dependabot rebase.

---

Dependabot commands and options

You can trigger Dependabot actions by commenting on this PR:

• @dependabot rebase will rebase this PR
• @dependabot recreate will recreate this PR, overwriting any edits that have been made to it
• @dependabot merge will merge this PR after your CI passes on it
• @dependabot squash and merge will squash and merge this PR after your CI passes on it
• @dependabot cancel merge will cancel a previously requested merge and block automerging
• @dependabot reopen will reopen this PR if it is closed
• @dependabot close will close this PR and stop Dependabot recreating it. You can achieve the same result by closing it manually
• @dependabot show <dependency name> ignore conditions will show all of the ignore conditions of the specified dependency
• @dependabot ignore <dependency name> major version will close this group update PR and stop Dependabot creating any more for the specific dependency's major version (unless you unignore this specific dependency's major version or upgrade to it yourself)
• @dependabot ignore <dependency name> minor version will close this group update PR and stop Dependabot creating any more for the specific dependency's minor version (unless you unignore this specific dependency's minor version or upgrade to it yourself)
• @dependabot ignore <dependency name> will close this group update PR and stop Dependabot creating any more for the specific dependency (unless you unignore this specific dependency or upgrade to it yourself)
• @dependabot unignore <dependency name> will remove all of the ignore conditions of the specified dependency
• @dependabot unignore <dependency name> <ignore condition> will remove the ignore condition of the specified dependency and ignore conditions