Bump shiki from 1.5.2 to 1.6.0 (#5844)

Bumps [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki)
from 1.5.2 to 1.6.0.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/shikijs/shiki/releases">shiki's
releases</a>.</em></p>
<blockquote>
<h2>v1.6.0</h2>
<h3>   🚀 Features</h3>
<ul>
<li>Scoped color replacements  -  by <a
href="https://github.com/QuentinRoy"><code>@​QuentinRoy</code></a> in <a
href="https://redirect.github.com/shikijs/shiki/issues/680">shikijs/shiki#680</a>
<a href="https://github.com/shikijs/shiki/commit/ed31ee55"><!-- raw HTML
omitted -->(ed31e)<!-- raw HTML omitted --></a></li>
<li>New <code>regexp</code> grammar  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> <a
href="https://github.com/shikijs/shiki/commit/8ea85136"><!-- raw HTML
omitted -->(8ea85)<!-- raw HTML omitted --></a></li>
</ul>
<h5>    <a
href="https://github.com/shikijs/shiki/compare/v1.5.2...v1.6.0">View
changes on GitHub</a></h5>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/shikijs/shiki/commit/a46ca6b96f3e9526b967669c56e180ca21b7b9ad"><code>a46ca6b</code></a>
chore: release v1.6.0</li>
<li><a
href="https://github.com/shikijs/shiki/commit/8ea85136f4364f03133664a2ac88cc78c23a2efb"><code>8ea8513</code></a>
feat: new <code>regexp</code> grammar</li>
<li><a
href="https://github.com/shikijs/shiki/commit/ed31ee55b94931df012e1146cbde34ccd9358520"><code>ed31ee5</code></a>
feat: scoped color replacements (<a
href="https://github.com/shikijs/shiki/tree/HEAD/packages/shiki/issues/680">#680</a>)</li>
<li>See full diff in <a
href="https://github.com/shikijs/shiki/commits/v1.6.0/packages/shiki">compare
view</a></li>
</ul>
</details>
<br />


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package.json

@@ -36,6 +36,6 @@
     "markdown-it-deflist": "^3.0.0",
     "markdown-it-table": "^4.1.1",
     "sass": "^1.77.2",
-    "shiki": "^1.5.2"
+    "shiki": "^1.6.0"
   }
 }