Bump shiki from 1.20.0 to 1.21.0 (#6116)

Bumps [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki)
from 1.20.0 to 1.21.0.
<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>v1.21.0</h2>
<h3>   🚀 Features</h3>
<ul>
<li><strong>perf</strong>:
<ul>
<li>Lazy embed languages bundle for SFCs and Docs  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> in <a
href="https://redirect.github.com/shikijs/shiki/issues/791">shikijs/shiki#791</a>
<a href="https://github.com/shikijs/shiki/commit/c8accc96"><!-- raw HTML
omitted -->(c8acc)<!-- raw HTML omitted --></a></li>
<li>Skip bundling for assets  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> in <a
href="https://redirect.github.com/shikijs/shiki/issues/795">shikijs/shiki#795</a>
<a href="https://github.com/shikijs/shiki/commit/0c5a51a7"><!-- raw HTML
omitted -->(0c5a5)<!-- raw HTML omitted --></a></li>
</ul>
</li>
</ul>
<h3>   🐞 Bug Fixes</h3>
<ul>
<li>Avoid using deprecated APIs in core  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> <a
href="https://github.com/shikijs/shiki/commit/cd184493"><!-- raw HTML
omitted -->(cd184)<!-- raw HTML omitted --></a></li>
</ul>
<h5>    <a
href="https://github.com/shikijs/shiki/compare/v1.20.0...v1.21.0">View
changes on GitHub</a></h5>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/shikijs/shiki/commit/d38f41eb9998312f07b8d5e241375b5e59b7871e"><code>d38f41e</code></a>
chore: release v1.21.0</li>
<li><a
href="https://github.com/shikijs/shiki/commit/d6f478443b0f2598c681fa85b026550563180c2c"><code>d6f4784</code></a>
docs: update grammar report</li>
<li><a
href="https://github.com/shikijs/shiki/commit/0c5a51a76e4715f38e83451fd4ba633b331990ce"><code>0c5a51a</code></a>
feat(perf): skip bundling for assets (<a
href="https://github.com/shikijs/shiki/tree/HEAD/packages/shiki/issues/795">#795</a>)</li>
<li><a
href="https://github.com/shikijs/shiki/commit/c8accc96c06e74394b98dcbfc8cd5dd438945d3e"><code>c8accc9</code></a>
feat(perf): lazy embed languages bundle for SFCs and Docs (<a
href="https://github.com/shikijs/shiki/tree/HEAD/packages/shiki/issues/791">#791</a>)</li>
<li><a
href="https://github.com/shikijs/shiki/commit/cd18449318e7d3713b906b8564dd7859420d315c"><code>cd18449</code></a>
fix: avoid using deprecated APIs in core</li>
<li>See full diff in <a
href="https://github.com/shikijs/shiki/commits/v1.21.0/packages/shiki">compare
view</a></li>
</ul>
</details>
<br />


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package.json

@@ -36,6 +36,6 @@
     "markdown-it-container": "^4.0.0",
     "markdown-it-deflist": "^3.0.0",
     "sass": "^1.79.4",
-    "shiki": "^1.20.0"
+    "shiki": "^1.21.0"
   }
 }