Update tox requirement from ~=4.8 to ~=4.9

[dependabot]

Updates the requirements on tox to permit the latest version.

Release notes

Sourced from tox's releases.

4.9.0

What's Changed

• Disallow command line environments which are not explicitly specified in the config file by @​tjsmart in tox-dev/tox#3089
• [pre-commit.ci] pre-commit autoupdate by @​pre-commit-ci in tox-dev/tox#3091

New Contributors

• @​tjsmart made their first contribution in tox-dev/tox#3089

Full Changelog: tox-dev/tox@4.8.0...4.9.0

Changelog

Sourced from tox's changelog.

v4.9.0 (2023-08-16)

Features - 4.9.0

- Disallow command line environments which are not explicitly specified in the config file - by :user:`tjsmart`. (:issue:`2858`)
v4.8.0 (2023-08-12)
Features - 4.8.0

• --override can now take options in the form of foo+=bar which will append bar to the end of an existing list/dict, rather than replacing it. (:issue:3087)

v4.7.0 (2023-08-08)

Features - 4.7.0

- Make --hashseed default to PYTHONHASHSEED, if defined - by :user:`paravoid`.
  The main motivation for this is to able to set the hash seed when building the
  documentation with "tox -e docs", and thus avoid embedding a random value in
  the tox documentation for --help. This caused documentation builds to fail to
  build reproducibly. (:issue:`2942`)
Bugfixes - 4.7.0

• Update a regular expression in tests to match the exception message in both Python 3.12 and older. (:issue:3065)

Improved Documentation - 4.7.0

- Fix broken links - by :user:`gaborbernat`. (:issue:`3072`)
v4.6.4 (2023-07-06)
Bugfixes - 4.6.4
- Fix hang and zombie process on interrupt (CTRL-C). (:issue:`3056`)
v4.6.3 (2023-06-19)
Bugfixes - 4.6.3

</tr></table>

</code></pre>

</blockquote>

<p>... (truncated)</p>

</details>

<details>

<summary>Commits</summary>
<ul>

<li><a href="https://github.com/tox-dev/tox/commit/3627f11bee3190abe5ce09ea114eea0d8a1f7e69&quot;&gt;&lt;code&gt;3627f11&lt;/code&gt;&lt;/a> release 4.9.0</li>

<li><a href="https://github.com/tox-dev/tox/commit/6ca8d9bf6f6613d31bd0277c90d322001a9bca34&quot;&gt;&lt;code&gt;6ca8d9b&lt;/code&gt;&lt;/a> [pre-commit.ci] pre-commit autoupdate (<a href="https://redirect.github.com/tox-dev/tox/issues/3091&quot;&gt;#3091&lt;/a&gt;)&lt;/li>

<li><a href="https://github.com/tox-dev/tox/commit/21244587ae7ec478645edc46cbf16098dd9f2e70&quot;&gt;&lt;code&gt;2124458&lt;/code&gt;&lt;/a> Disallow command line environments which are not explicitly specified in the ...</li>

<li>See full diff in <a href="https://github.com/tox-dev/tox/compare/4.8.0...4.9.0&quot;&gt;compare view</a></li>

</ul>

</details>
<br />


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