build(deps): bump defu from 6.1.4 to 6.1.6 in /site (#8135)

Bumps [defu](https://github.com/unjs/defu) from 6.1.4 to 6.1.6.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/unjs/defu/releases">defu's
releases</a>.</em></p>
<blockquote>
<h2>v6.1.6</h2>
<p><a
href="https://github.com/unjs/defu/compare/v6.1.5...v6.1.6">compare
changes</a></p>
<h3>📦 Build</h3>
<ul>
<li>Fix mixed types (<a
href="https://github.com/unjs/defu/commit/407b516">407b516</a>)</li>
</ul>
<h2>v6.1.5</h2>
<p><a
href="https://github.com/unjs/defu/compare/v6.1.4...v6.1.5">compare
changes</a></p>
<h3>🩹 Fixes</h3>
<ul>
<li>Prevent prototype pollution via <code>__proto__</code> in defaults
(<a href="https://redirect.github.com/unjs/defu/pull/156">#156</a>)</li>
<li>Ignore inherited enumerable properties (<a
href="https://github.com/unjs/defu/commit/11ba022">11ba022</a>)</li>
</ul>
<h3>✅ Tests</h3>
<ul>
<li>Add more tests for plain objects (<a
href="https://github.com/unjs/defu/commit/b65f603">b65f603</a>)</li>
</ul>
<h3>❤️ Contributors</h3>
<ul>
<li>Pooya Parsa (<a
href="https://github.com/pi0"><code>@​pi0</code></a>)</li>
<li>Kricsleo (<a
href="https://github.com/kricsleo"><code>@​kricsleo</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Changelog</summary>
<p><em>Sourced from <a
href="https://github.com/unjs/defu/blob/main/CHANGELOG.md">defu's
changelog</a>.</em></p>
<blockquote>
<h2>v6.1.6</h2>
<p><a
href="https://github.com/unjs/defu/compare/v6.1.5...v6.1.6">compare
changes</a></p>
<h3>📦 Build</h3>
<ul>
<li>Fix mixed types (<a
href="https://github.com/unjs/defu/commit/407b516">407b516</a>)</li>
</ul>
<h3>❤️ Contributors</h3>
<ul>
<li>Pooya Parsa (<a
href="https://github.com/pi0"><code>@​pi0</code></a>)</li>
</ul>
<h2>v6.1.5</h2>
<p><a
href="https://github.com/unjs/defu/compare/v6.1.4...v6.1.5">compare
changes</a></p>
<h3>🩹 Fixes</h3>
<ul>
<li>Prevent prototype pollution via <code>__proto__</code> in defaults
(<a href="https://redirect.github.com/unjs/defu/pull/156">#156</a>)</li>
<li>Ignore inherited enumerable properties (<a
href="https://github.com/unjs/defu/commit/11ba022">11ba022</a>)</li>
</ul>
<h3>🏡 Chore</h3>
<ul>
<li>Add tea.yaml (<a
href="https://github.com/unjs/defu/commit/70cffe5">70cffe5</a>)</li>
<li>Update repo (<a
href="https://github.com/unjs/defu/commit/23cc432">23cc432</a>)</li>
<li>Fix typecheck (<a
href="https://github.com/unjs/defu/commit/89df6bb">89df6bb</a>)</li>
</ul>
<h3>✅ Tests</h3>
<ul>
<li>Add more tests for plain objects (<a
href="https://github.com/unjs/defu/commit/b65f603">b65f603</a>)</li>
</ul>
<h3>🤖 CI</h3>
<ul>
<li>Bump node (<a
href="https://github.com/unjs/defu/commit/9237d9c">9237d9c</a>)</li>
</ul>
<h3>❤️ Contributors</h3>
<ul>
<li>Pooya Parsa (<a
href="https://github.com/pi0"><code>@​pi0</code></a>)</li>
<li>Kricsleo (<a
href="https://github.com/kricsleo"><code>@​kricsleo</code></a>)</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/unjs/defu/commit/001c2906010eb65c1bb13ccd1f4abea09e10405b"><code>001c290</code></a>
chore(release): v6.1.6</li>
<li><a
href="https://github.com/unjs/defu/commit/407b51645c41a57da6efac5b40967f2c60ce4f12"><code>407b516</code></a>
build: fix mixed types</li>
<li><a
href="https://github.com/unjs/defu/commit/23e59e684cb6a432aad13f308d142247e31b6315"><code>23e59e6</code></a>
chore(release): v6.1.5</li>
<li><a
href="https://github.com/unjs/defu/commit/11ba02213d4b1c6b02dd686041f75edc479c98e9"><code>11ba022</code></a>
fix: ignore inherited enumerable properties</li>
<li><a
href="https://github.com/unjs/defu/commit/3942bfbbcaa72084bd4284846c83bd61ed7c8b29"><code>3942bfb</code></a>
fix: prevent prototype pollution via <code>__proto__</code> in defaults
(<a
href="https://redirect.github.com/unjs/defu/issues/156">#156</a>)</li>
<li><a
href="https://github.com/unjs/defu/commit/d3ef16dabe861713192ba8679c5db8e0ac143f9b"><code>d3ef16d</code></a>
chore(deps): update actions/checkout action to v6 (<a
href="https://redirect.github.com/unjs/defu/issues/151">#151</a>)</li>
<li><a
href="https://github.com/unjs/defu/commit/869a053effb7b1bf49a1635e1bb211840daa589e"><code>869a053</code></a>
chore(deps): update actions/setup-node action to v6 (<a
href="https://redirect.github.com/unjs/defu/issues/149">#149</a>)</li>
<li><a
href="https://github.com/unjs/defu/commit/a97310c6a52bd33b3bb1bb0f7d94df5a1461e732"><code>a97310c</code></a>
chore(deps): update codecov/codecov-action action to v6 (<a
href="https://redirect.github.com/unjs/defu/issues/154">#154</a>)</li>
<li><a
href="https://github.com/unjs/defu/commit/89df6bb1dfb4161b9d285f96e0b4ad1a993a647c"><code>89df6bb</code></a>
chore: fix typecheck</li>
<li><a
href="https://github.com/unjs/defu/commit/9237d9c92059317142b30d7385f0e7bbb0ee82b4"><code>9237d9c</code></a>
ci: bump node</li>
<li>Additional commits viewable in <a
href="https://github.com/unjs/defu/compare/v6.1.4...v6.1.6">compare
view</a></li>
</ul>
</details>
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