Bump @storybook/manager-api from 8.6.3 to 8.6.4 (#13352)

Bumps
[@storybook/manager-api](https://github.com/storybookjs/storybook/tree/HEAD/code/lib/manager-api)
from 8.6.3 to 8.6.4.
<details>
<summary>Release notes</summary>
<p><em>Sourced from <a
href="https://github.com/storybookjs/storybook/releases"><code>@​storybook/manager-api</code>'s
releases</a>.</em></p>
<blockquote>
<h2>v8.6.4</h2>
<h2>8.6.4</h2>
<ul>
<li>Manager: Add Content-Type to fix Cloud IDEs - <a
href="https://redirect.github.com/storybookjs/storybook/pull/30606">#30606</a>,
thanks <a
href="https://github.com/GCHQDeveloper548"><code>@​GCHQDeveloper548</code></a>!</li>
<li>Vite: Include <code>node_modules</code> in stats file - <a
href="https://redirect.github.com/storybookjs/storybook/pull/30711">#30711</a>,
thanks <a
href="https://github.com/JReinhold"><code>@​JReinhold</code></a>!</li>
</ul>
</blockquote>
</details>
<details>
<summary>Commits</summary>
<ul>
<li>See full diff in <a
href="https://github.com/storybookjs/storybook/commits/v8.6.4/code/lib/manager-api">compare
view</a></li>
</ul>
</details>
<br />


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Signed-off-by: dependabot[bot] <[email protected]>
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Author: dependabot[bot]

pnpm-lock.yaml

@@ -80,7 +80,7 @@
     "@storybook/addon-viewport": "^8.6.4",
     "@storybook/blocks": "^8.6.4",
     "@storybook/components": "^8.6.4",
-    "@storybook/manager-api": "^8.6.3",
+    "@storybook/manager-api": "^8.6.4",
     "@storybook/preview-api": "^8.6.4",
     "@storybook/react": "^8.6.3",
     "@storybook/react-vite": "^8.6.3",