Bump shiki from 1.19.0 to 1.20.0 (#6112)

Bumps [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki)
from 1.19.0 to 1.20.0.
<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>v1.20.0</h2>
<h3>   🚀 Features</h3>
<ul>
<li>Rename <code>createWasmOnigEngine</code> to
<code>createOnigurumaEngine</code>  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> <a
href="https://github.com/shikijs/shiki/commit/2335dda7"><!-- raw HTML
omitted -->(2335d)<!-- raw HTML omitted --></a></li>
<li>Move <code>createCssVariablesTheme</code> to core  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> <a
href="https://github.com/shikijs/shiki/commit/989afdb4"><!-- raw HTML
omitted -->(989af)<!-- raw HTML omitted --></a></li>
<li><strong>rehype</strong>: Support lazy load languages  -  by <a
href="https://github.com/fuma-nama"><code>@​fuma-nama</code></a> and <a
href="https://github.com/antfu"><code>@​antfu</code></a> in <a
href="https://redirect.github.com/shikijs/shiki/issues/787">shikijs/shiki#787</a>
<a href="https://github.com/shikijs/shiki/commit/c449dd13"><!-- raw HTML
omitted -->(c449d)<!-- raw HTML omitted --></a></li>
</ul>
<h3>   🐞 Bug Fixes</h3>
<ul>
<li>Improve deprecation warnings  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> <a
href="https://github.com/shikijs/shiki/commit/50c8e4ac"><!-- raw HTML
omitted -->(50c8e)<!-- raw HTML omitted --></a></li>
</ul>
<h5>    <a
href="https://github.com/shikijs/shiki/compare/v1.19.0...v1.20.0">View
changes on GitHub</a></h5>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/shikijs/shiki/commit/6aa7e08e9232d052ccbd8c9850599c7581f0e8b5"><code>6aa7e08</code></a>
chore: release v1.20.0</li>
<li><a
href="https://github.com/shikijs/shiki/commit/d5ec824640a90eabeb4312fd00ac7cfcab90d186"><code>d5ec824</code></a>
chore: update deps</li>
<li><a
href="https://github.com/shikijs/shiki/commit/989afdb4a888072f6206000ccc35a15db1032fda"><code>989afdb</code></a>
feat: move <code>createCssVariablesTheme</code> to core</li>
<li><a
href="https://github.com/shikijs/shiki/commit/50c8e4ac14357fe0cd54bac2d0d12fd05f34921e"><code>50c8e4a</code></a>
fix: improve deprecation warnings</li>
<li><a
href="https://github.com/shikijs/shiki/commit/2335dda7afd5e7e42ae2fc4484694a2709f02278"><code>2335dda</code></a>
feat: rename <code>createWasmOnigEngine</code> to
<code>createOnigurumaEngine</code></li>
<li>See full diff in <a
href="https://github.com/shikijs/shiki/commits/v1.20.0/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": "^1.79.3",
-    "shiki": "^1.19.0"
+    "shiki": "^1.20.0"
   }
 }