This PR contains the following updates:

| Package | Change | [Age](https://docs.renovatebot.com/merge-confidence/) | [Confidence](https://docs.renovatebot.com/merge-confidence/) |
|---|---|---|---|
| [astro](https://astro.build) ([source](https://github.com/withastro/astro/tree/HEAD/packages/astro)) | [`6.0.3` → `6.0.4`](https://renovatebot.com/diffs/npm/astro/6.0.3/6.0.4) | ![age](https://developer.mend.io/api/mc/badges/age/npm/astro/6.0.4?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/astro/6.0.3/6.0.4?slim=true) |

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### Release Notes

<details>
<summary>withastro/astro (astro)</summary>

### [`v6.0.4`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#604)

[Compare Source](https://github.com/withastro/astro/compare/astro@6.0.3...astro@6.0.4)

##### Patch Changes

- [#&#8203;15870](withastro/astro#15870) [`920f10b`](withastro/astro@920f10b) Thanks [@&#8203;matthewp](https://github.com/matthewp)! - Prebundle `astro/toolbar` in dev when custom dev toolbar apps are registered, preventing re-optimization reloads that can hide or break the toolbar.

- [#&#8203;15876](withastro/astro#15876) [`f47ac53`](withastro/astro@f47ac53) Thanks [@&#8203;ematipico](https://github.com/ematipico)! - Fixes `redirectToDefaultLocale` producing a protocol-relative URL (`//locale`) instead of an absolute path (`/locale`) when `base` is `'/'`.

- [#&#8203;15767](withastro/astro#15767) [`e0042f7`](withastro/astro@e0042f7) Thanks [@&#8203;matthewp](https://github.com/matthewp)! - Fixes server islands (`server:defer`) not working when only used in prerendered pages with `output: 'server'`.

- [#&#8203;15873](withastro/astro#15873) [`35841ed`](withastro/astro@35841ed) Thanks [@&#8203;matthewp](https://github.com/matthewp)! - Fix a dev server bug where newly created pages could miss layout-imported CSS until restart.

- [#&#8203;15874](withastro/astro#15874) [`ce0669d`](withastro/astro@ce0669d) Thanks [@&#8203;ematipico](https://github.com/ematipico)! - Fixes a warning when using `prefetchAll`

- [#&#8203;15754](withastro/astro#15754) [`58f1d63`](withastro/astro@58f1d63) Thanks [@&#8203;rururux](https://github.com/rururux)! - Fixes a bug where a directory at the project root sharing the same name as a page route would cause the dev server to return a 404 instead of serving the page.

- [#&#8203;15869](withastro/astro#15869) [`76b3a5e`](withastro/astro@76b3a5e) Thanks [@&#8203;matthewp](https://github.com/matthewp)! - Update the unknown file extension error hint to recommend `vite.resolve.noExternal`, which is the correct Vite 7 config key.

</details>

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