chore(deps-dev): update tox requirement from 4.16.0 to 4.26.0

[dependabot]

Updates the requirements on tox to permit the latest version.

Release notes

Sourced from tox's releases.

4.26.0

What's Changed

• Add a missing quote in a TOML example @ config.rst by @​webknjaz in tox-dev/tox#3509
• Add colour to GitHub Actions CI logs by @​hugovk in tox-dev/tox#3525
• Fix using deprecated virtualenv option --wheel by @​robsdedude in tox-dev/tox#3528
• Fix custom HelpFormatter for Python 3.14 by @​The-Compiler in tox-dev/tox#3524
• Drop support for EOL Python 3.8 by @​hugovk in tox-dev/tox#3527
• Test with Python 3.14 by @​edgarrmondragon in tox-dev/tox#3533
• Fix for tox4 regression issue with setenv file and substitutions (#2435) by @​realitycheck in tox-dev/tox#3521
• Feat: free-threaded python support by @​robsdedude in tox-dev/tox#3526

New Contributors

• @​edgarrmondragon made their first contribution in tox-dev/tox#3533
• @​realitycheck made their first contribution in tox-dev/tox#3521

Full Changelog: tox-dev/tox@4.25.0...4.26.0

Changelog

Sourced from tox's changelog.

v4.26.0 (2025-05-13)

Features - 4.26.0

- Add support for free-threaded python builds.
  Factors like ``py313t`` will only pick builds with the GIL disabled while factors without trailing ``t`` will only pick
  builds without no-GIL support. (:issue:`3391`)
- Drop support for EOL Python 3.8. (:issue:`3527`)
Bugfixes - 4.26.0

• Fix a regression issue related to inability to use file| substitution option in nested set_env sections of ini configurations since tox4 update. (:issue:2435)
• Fix TypeError for HelpFormatter with Python 3.14 (:issue:3523)

v4.25.0 (2025-03-27)

Features - 4.25.0

- Add support for number ranges in generative environments, more details :ref:`here<generative-environment-list>`. - by :user:`mimre25` (:issue:`3502`)
Bugfixes - 4.25.0

• Make tox tests pass with Python 3.14.0a6
  • by :user:hroncok (:issue:3500)

v4.24.2 (2025-03-07)

Bugfixes - 4.24.2

- multiple source_type supports for the same filename. Like pyproject.toml can be load by both TomlPyProject & LegacyToml (:issue:`3117`)
- Support ``set_env = { file = "conf{/}local.env"}`` for TOML format - by :user:`juditnovak`. (:issue:`3474`)
- fix example on the docs (:issue:`3480`)
- - ``--parallel-no-spinner`` now respects max CPU set by ``--parallel N`` (:issue:`3495`)
Improved Documentation - 4.24.2

• Updates the documentation for os.environ['KEY'] when the variable does not exist - by :user:jugmac00. (:issue:3456)

v4.24.1 (2025-01-21)

Misc - 4.24.1

- :issue:`3426`
v4.24.0 (2025-01-21)
</tr></table>

... (truncated)

Commits

• 7c3fae8 release 4.26.0
• 92d4ed3 Feat: free-threaded python support (#3526)
• 957f2f8 Fix for tox4 regression issue with setenv file and substitutions (#2435) (#3521)
• 5f07ba8 Test with Python 3.14 (#3533)
• 50e51eb Drop support for EOL Python 3.8 (#3527)
• 19126da Fix custom HelpFormatter for Python 3.14 (#3524)
• f082f80 [pre-commit.ci] pre-commit autoupdate (#3522)
• 51aac32 Fix using deprecated virtualenv option --wheel (#3528)
• b770ed5 Add colour to CI logs (#3525)
• 4a8e50e [pre-commit.ci] pre-commit autoupdate (#3520)
• Additional commits viewable in compare view

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