tools(deps-dev): Update icanhazstring/composer-unused requirement from 0.8.11 to 0.9.1 in /tools/composer-unused (#539)

Updates the requirements on
[icanhazstring/composer-unused](https://github.com/composer-unused/composer-unused)
to permit the latest version.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/composer-unused/composer-unused/releases">icanhazstring/composer-unused's
releases</a>.</em></p>
<blockquote>
<h2>0.9.1</h2>
<h2>What's Changed</h2>
<ul>
<li>Add support for phpstan/phpdoc-parser v2 by <a
href="https://github.com/WyriHaximus"><code>@​WyriHaximus</code></a> in
<a
href="https://redirect.github.com/composer-unused/composer-unused/pull/670">composer-unused/composer-unused#670</a></li>
</ul>
<p><strong>Full Changelog</strong>: <a
href="https://github.com/composer-unused/composer-unused/compare/0.9.0...0.9.1">https://github.com/composer-unused/composer-unused/compare/0.9.0...0.9.1</a></p>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/a9c93d99b5f3d71f244473fa0dcd69c385dac361"><code>a9c93d9</code></a>
Add support for phpstan/phpdoc-parser v2</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/7cc681c8b2dab6081865441510adfa10422639eb"><code>7cc681c</code></a>
chore: Remove baseline errors</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/3dccde769de9761715c32e23af25dfb67a1a0213"><code>3dccde7</code></a>
fix: Readd available autowire services</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/1d09c78a4df302ed1c980a85ff4e64b8db455b76"><code>1d09c78</code></a>
chore: Remove unused dependency phpstan/phpdoc-parser</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/a9056906e2184ad87748b104de53b062d3da3b9e"><code>a905690</code></a>
chore: Update dependencies</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/ba75c3203fe3edf7001289463e753db53862343d"><code>ba75c32</code></a>
feat: Whitelist php8.3 and 8.4 polyfill for box builds</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/be80fbdd2fe4988144fb5375eb51bc6c4d0af530"><code>be80fbd</code></a>
feat: Add php8.4 and 8.3 dockerfile</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/124d440de570d401653a97d1abe77fad1855ffb5"><code>124d440</code></a>
Remove plugin update job</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/d8c00b8540795996426c22cdac2e6e8b6e0f4e67"><code>d8c00b8</code></a>
Build PHAR with PHP 8.4</li>
<li><a
href="https://github.com/composer-unused/composer-unused/commit/a81ef2bd07146430ed55848ef6f5260f0a027721"><code>a81ef2b</code></a>
Drop support for nikic/php-parser 4</li>
<li>Additional commits viewable in <a
href="https://github.com/composer-unused/composer-unused/compare/0.8.11...0.9.1">compare
view</a></li>
</ul>
</details>
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tools/composer-unused/composer.json

@@ -6,7 +6,7 @@
         "php": "^8.1.31"
     },
     "require-dev": {
-        "icanhazstring/composer-unused": "0.8.11",
+        "icanhazstring/composer-unused": "0.9.1",
         "roave/security-advisories": "dev-latest"
     },
     "prefer-stable": true,