chore(deps-dev): Update tox requirement from 4.30.2 to 4.30.3 (#977)

Updates the requirements on [tox](https://github.com/tox-dev/tox) to
permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/tox/releases">tox's
releases</a>.</em></p>
<blockquote>
<h2>4.30.3</h2>
<!-- raw HTML omitted -->
<h2>What's Changed</h2>
<ul>
<li>Isolate the test suite from any existing
<code>DEFAULT_CONFIG_FILE</code> file by <a
href="https://github.com/kurtmckee"><code>@​kurtmckee</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3612">tox-dev/tox#3612</a></li>
<li>Fix none config file issue 3611 by <a
href="https://github.com/kurtmckee"><code>@​kurtmckee</code></a> in <a
href="https://redirect.github.com/tox-dev/tox/pull/3613">tox-dev/tox#3613</a></li>
<li>[pre-commit.ci] pre-commit autoupdate by <a
href="https://github.com/pre-commit-ci"><code>@​pre-commit-ci</code></a>[bot]
in <a
href="https://redirect.github.com/tox-dev/tox/pull/3608">tox-dev/tox#3608</a></li>
<li>Fix incorrect type annotations in PythonPathPackageWithDeps (fixes
<a href="https://redirect.github.com/tox-dev/tox/issues/3607">#3607</a>)
by <a
href="https://github.com/PreistlyPython"><code>@​PreistlyPython</code></a>
in <a
href="https://redirect.github.com/tox-dev/tox/pull/3616">tox-dev/tox#3616</a></li>
<li>[pre-commit.ci] pre-commit autoupdate by <a
href="https://github.com/pre-commit-ci"><code>@​pre-commit-ci</code></a>[bot]
in <a
href="https://redirect.github.com/tox-dev/tox/pull/3615">tox-dev/tox#3615</a></li>
</ul>
<h2>New Contributors</h2>
<ul>
<li><a
href="https://github.com/PreistlyPython"><code>@​PreistlyPython</code></a>
made their first contribution in <a
href="https://redirect.github.com/tox-dev/tox/pull/3616">tox-dev/tox#3616</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/tox-dev/tox/compare/4.30.2...4.30.3">https://github.com/tox-dev/tox/compare/4.30.2...4.30.3</a></p>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/tox-dev/tox/blob/main/docs/changelog.rst">tox's
changelog</a>.</em></p>
<blockquote>
<h2>v4.30.3 (2025-10-02)</h2>
<p>Bugfixes - 4.30.3</p>
<pre><code>- Fix incorrect type annotation in
``PythonPathPackageWithDeps.__init__()``
  where ``deps`` was annotated as ``Sequence[Package]`` but should be
``Sequence[Requirement]`` to match actual runtime usage - by
:user:`PreistlyPython` (:issue:`3607`)
- Fix ``None`` appearing as the config filename in error output
when the user's default config file is corrupt. - by :user:`kurtmckee`
(:issue:`3611`)
<h2>v4.30.2 (2025-09-04)</h2>
<p>Bugfixes - 4.30.2
</code></pre></p>
<ul>
<li>Previously, when tox ran in an automatically provisioned
environment, it could hang waiting for a PEP 517 build backend
if used in conjunction with the <code>--installpkg</code> option. This
has been fixed by properly tearing down the automatically
provisioned environment after the tests.
<ul>
<li>by :user:<code>vytas7</code> (:issue:<code>3600</code>)</li>
</ul>
</li>
</ul>
<h2>v4.30.1 (2025-09-03)</h2>
<p>Bugfixes - 4.30.1</p>
<pre><code>- Prevent tox from hanging upon exit due to orphaned build
threads and subprocesses when the ``--installpkg`` option is
  used with *sdist*.
  - by :user:`vytas7` (:issue:`3530`)
<h2>v4.30.0 (2025-09-03)</h2>
<p>Features - 4.30.0
</code></pre></p>
<ul>
<li>Add <code>__TOX_ENVIRONMENT_VARIABLE_ORIGINAL_CI</code>, which
passes through the <code>CI</code> variable if present. This is intended
for use by other libraries to detect if tox is running under CI.
(:issue:<code>3442</code>)</li>
</ul>
<p>Bugfixes - 4.30.0</p>
<pre><code>- Makes the error message more clear when pyproject.toml file
cannot be loaded
  or is missing expected keys. (:issue:`3578`)
- The :func:`tox_extend_envs() hook
&lt;tox.plugin.spec.tox_extend_envs&gt;`
  recently added in :pull:`3591` turned out to not work well with
  ``tox run``. It was fixed internally, not to exhaust the underlying
  iterator on the first use.
<p>-- by :user:<code>webknjaz</code> (:issue:<code>3598</code>)</p>
<h2>v4.29.0 (2025-08-29)</h2>
<p>&lt;/tr&gt;&lt;/table&gt;
</code></pre></p>
</blockquote>
<p>... (truncated)</p>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/tox-dev/tox/commit/01442da183f81b63846182110f9cd697ad2a0eb5"><code>01442da</code></a>
release 4.30.3</li>
<li><a
href="https://github.com/tox-dev/tox/commit/984dc78b77278ec7640f301471f1b98756833ac8"><code>984dc78</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3615">#3615</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/660adb5ce9cbac73082231baa2b3a12494121b48"><code>660adb5</code></a>
Fix incorrect type annotations in PythonPathPackageWithDeps (fixes <a
href="https://redirect.github.com/tox-dev/tox/issues/3607">#3607</a>)
(<a
href="https://redirect.github.com/tox-dev/tox/issues/3">#3</a>...</li>
<li><a
href="https://github.com/tox-dev/tox/commit/393de39c10414e1ff9d02d70686373a185634199"><code>393de39</code></a>
[pre-commit.ci] pre-commit autoupdate (<a
href="https://redirect.github.com/tox-dev/tox/issues/3608">#3608</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/6e3242613ae17fbe46ce28d8e41a5dd54dc322cc"><code>6e32426</code></a>
Fix none config file issue 3611 (<a
href="https://redirect.github.com/tox-dev/tox/issues/3613">#3613</a>)</li>
<li><a
href="https://github.com/tox-dev/tox/commit/0805c8358687f6902b1793ed4616162dff733cb8"><code>0805c83</code></a>
Isolate the test suite from any existing
<code>DEFAULT_CONFIG_FILE</code> file (<a
href="https://redirect.github.com/tox-dev/tox/issues/3612">#3612</a>)</li>
<li>See full diff in <a
href="https://github.com/tox-dev/tox/compare/4.30.2...4.30.3">compare
view</a></li>
</ul>
</details>
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pyproject.toml

@@ -93,7 +93,7 @@ autopep8 = "2.3.2"
 mypy = "1.18.2"
 bandit = "1.8.6"
 tomli = { version = "^2.0.1", python = "<3.11" }
-tox = "4.30.2"
+tox = "4.30.3"
 pyupgrade = "3.20.0"
 deptry = "0.23.1"
 # for tests, use the GPL-version of jsonschema format validators - they are faster