Bump shiki from 1.1.7 to 1.2.0 (#5652)

Bumps [shiki](https://github.com/shikijs/shiki/tree/HEAD/packages/shiki)
from 1.1.7 to 1.2.0.
<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>v1.2.0</h2>
<h3>   🚀 Features</h3>
<ul>
<li>Upgrade deps, new lang <code>Gleam</code>, new theme
<code>Houston</code>  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> <a
href="https://github.com/shikijs/shiki/commit/163d83b6"><!-- raw HTML
omitted -->(163d8)<!-- raw HTML omitted --></a></li>
</ul>
<h3>   🏎 Performance</h3>
<ul>
<li>Bundle wasm binary in chunk for <code>shiki/wasm</code> and
<code>@shikijs/core/wasm-inlined</code>  -  by <a
href="https://github.com/antfu"><code>@​antfu</code></a> in <a
href="https://redirect.github.com/shikijs/shiki/issues/624">shikijs/shiki#624</a>
<a href="https://github.com/shikijs/shiki/commit/56d1a486"><!-- raw HTML
omitted -->(56d1a)<!-- raw HTML omitted --></a></li>
</ul>
<h5>    <a
href="https://github.com/shikijs/shiki/compare/v1.1.7...v1.2.0">View
changes on GitHub</a></h5>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li><a
href="https://github.com/shikijs/shiki/commit/fa42db59b1e22890a48e74daf4a7b6173dd05e02"><code>fa42db5</code></a>
chore: release v1.2.0</li>
<li><a
href="https://github.com/shikijs/shiki/commit/163d83b6d6629f8f431b21e9518a5d073d150834"><code>163d83b</code></a>
feat: upgrade deps, new lang <code>Gleam</code>, new theme
<code>Houston</code></li>
<li><a
href="https://github.com/shikijs/shiki/commit/56d1a486e39bd9cc8432cfa2c2a51b3ccfae3eda"><code>56d1a48</code></a>
perf: bundle wasm binary in chunk for <code>shiki/wasm</code> and
`@shikijs/core/wasm-in...</li>
<li>See full diff in <a
href="https://github.com/shikijs/shiki/commits/v1.2.0/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": "^1.72.0",
-    "shiki": "^1.1.7"
+    "shiki": "^1.2.0"
   }
 }