Update tox requirement from <4.2,>=3.20 to >=3.20,<4.3

[dependabot[bot]]

Updates the requirements on tox to permit the latest version.

Changelog

Sourced from tox's changelog.

v4.2.0 (2023-01-03)

Features - 4.2.0

- Packaging environments now inherit from the ``pkgenv`` section, allowing to set all your packaging options in one place,
  and support the ``deps`` key to set additional dependencies that will be installed after ``pyproject.toml`` static
  ``requires`` but before backends dynamic requires - by :user:`gaborbernat`. (:issue:`2543`)
Improved Documentation - 4.2.0

• Document breaking changes with tox 4 and packaging environments - by :user:gaborbernat. (:issue:2543)
• Document how to handle environments whose names match tox subcommands - by :user:sirosen. (:issue:2728)

v4.1.3 (2023-01-02)

Bugfixes - 4.1.3

- Reuse package_env with ``--installpkg`` - by :user:`q0w`. (:issue:`2442`)
- Fail more gracefully when pip :ref:`install_command` is empty - by :user:`jayaddison`. (:issue:`2695`)
Improved Documentation - 4.1.3

• Add breaking-change documentation for empty install_command values - by :user:jayaddison. (:issue:2695)

Misc - 4.1.3

- :issue:`2796`, :issue:`2797`
v4.1.2 (2022-12-30)
Bugfixes - 4.1.2

• Fix --skip-missing-interpreters behaviour - by :user:q0w. (:issue:2649)
• Restore tox 3 behaviour of showing the output of pip freeze, however now only active when running inside a CI environment - by :user:gaborbernat. (:issue:2685)
• Fix extracting extras from markers with many extras - by :user:q0w. (:issue:2791)

v4.1.1 (2022-12-29)

Bugfixes - 4.1.1

- Fix logging error with emoji in git branch name. (:issue:`2768`)
</tr></table>

... (truncated)

Commits

• d16a666 release 4.2.0
• 82dcd45 Packaging inherits from pkgenv, deps and document tox 4 packaging changes (#2...
• 31c8d1f Document ambiguous usages in v3-to-v4 (#2808)
• 031e902 Introduce Upgrading doc page for tox4 (#2805)
• d05ea02 release 4.1.3
• 997128c Better message when command parsing on empty input (#2807)
• d202833 issue 2695/tox4 install command breaking change docs (#2806)
• 8244a05 Reuse package_env with --installpkg (#2803)
• 26e293f Skip time-machine dep and spinner tests on PyPy (#2797)
• bfba43c Relax test_list_installed_deps() to allow other packages (#2796)
• Additional commits viewable 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 ignore this major version` will close this PR and stop Dependabot creating any more for this major version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this minor version` will close this PR and stop Dependabot creating any more for this minor version (unless you reopen the PR or upgrade to it yourself) - `@dependabot ignore this dependency` will close this PR and stop Dependabot creating any more for this dependency (unless you reopen the PR or upgrade to it yourself)