[Python]: Update tox requirement from <4.0,>=3.26 to >=3.26,<5.0 in /requirements

[dependabot[bot]]

Updates the requirements on tox to permit the latest version.

Release notes

Sourced from tox's releases.

4.0.18

What's Changed

• Handle whitespace around requirements by @​gaborbernat in tox-dev/tox#2779

Full Changelog: https://github.com/tox-dev/tox/compare/4.0.17...4.0.18

Changelog

Sourced from tox's changelog.

v4.0.18 (2022-12-26)

Bugfixes - 4.0.18

- Strip leading and trailing whitespace when parsing elements in requirement files - by :user:`gaborbernat`. (:issue:`2773`)
v4.0.17 (2022-12-25)
Features - 4.0.17

• Suppress a report output when verbosity = 0. (:issue:2697)

Bugfixes - 4.0.17

- Fix ``--sdistonly`` behaviour. (:issue:`2653`)
- Override toxworkdir with --workdir. (:issue:`2654`)
v4.0.16 (2022-12-20)
Bugfixes - 4.0.16

• Fix :ref:change_dir is relative to current working directory rather than to the :ref:tox_root when using the -c argument to locate the tox.ini file - by :user:gaborbernat. (:issue:2619)

v4.0.15 (2022-12-19)

Bugfixes - 4.0.15

- Fix tox auto-provisioning not working and relax :ref:`min_version` default from ``4.0`` to no version constraint
  - by :user:`gaborbernat`. (:issue:`2634`)
- Fix assertion in ``test_result_json_sequential`` when interpreter ``_base_executable`` is a hardlink (macOS homebrew)
  - by :user:`masenf`. (:issue:`2720`)
- Complex negative factor filters not working  - by :user:`gaborbernat`. (:issue:`2747`)
v4.0.14 (2022-12-18)
Bugfixes - 4.0.14

• Do not include non test environment sections or factor filters in INI configuration to factor discovery - by :user:gaborbernat. (:issue:2746)

... (truncated)

Commits

• 2ec5879 release 4.0.18
• acac244 Handle whitespace around requirements (#2779)
• d970c76 release 4.0.17
• bf87bea Override toxworkdir with --workdir. (#2776)
• a36ff9d Fix --sdistonly behaviour (#2775)
• b0c3cf6 Suppress a report output when verbosity = 0. (#2774)
• d8e86dd Update README.md
• 463cd12 Update README.md
• f460c84 release 4.0.16
• 47052d4 Fix change_dir is not always relative to tox_root (#2761)
• Additional commits viewable in compare view

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The following labels could not be found: lang/python.