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)) | [`6.0.2` → `6.0.3`](https://renovatebot.com/diffs/npm/astro/6.0.2/6.0.3) | ![age](https://developer.mend.io/api/mc/badges/age/npm/astro/6.0.3?slim=true) | ![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/astro/6.0.2/6.0.3?slim=true) |

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### Release Notes

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

### [`v6.0.3`](https://github.com/withastro/astro/blob/HEAD/packages/astro/CHANGELOG.md#603)

[Compare Source](https://github.com/withastro/astro/compare/astro@6.0.2...astro@6.0.3)

##### Patch Changes

- [#&#8203;15711](withastro/astro#15711) [`b2bd27b`](withastro/astro@b2bd27b) Thanks [@&#8203;OliverSpeir](https://github.com/OliverSpeir)! - Improves Astro core's dev environment handling for prerendered routes by ensuring route/CSS updates and prerender middleware behavior work correctly across both SSR and prerender environments.

  This enables integrations that use Astro's prerender dev environment (such as Cloudflare with `prerenderEnvironment: 'node'`) to get consistent route matching and HMR behavior during development.

- [#&#8203;15852](withastro/astro#15852) [`1cdaf9f`](withastro/astro@1cdaf9f) Thanks [@&#8203;ematipico](https://github.com/ematipico)! - Fixes a regression where the the routes emitted by the `astro:build:done` hook didn't have the `distURL` array correctly populated.

- [#&#8203;15765](withastro/astro#15765) [`ca76ff1`](withastro/astro@ca76ff1) Thanks [@&#8203;matthewp](https://github.com/matthewp)! - Hardens server island POST endpoint validation to use own-property checks for improved consistency

</details>

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