chore(deps): bump astro, @astrojs/starlight and starlight-llms-txt

Bumps [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro), [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) and [starlight-llms-txt](https://github.com/delucis/starlight-llms-txt/tree/HEAD/packages/starlight-llms-txt). These dependencies needed to be updated together.

Updates `astro` from 6.2.1 to 7.1.3
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/astro@7.1.3/packages/astro)

Updates `@astrojs/starlight` from 0.38.4 to 0.41.3
- [Release notes](https://github.com/withastro/starlight/releases)
- [Changelog](https://github.com/withastro/starlight/blob/main/packages/starlight/CHANGELOG.md)
- [Commits](https://github.com/withastro/starlight/commits/@astrojs/starlight@0.41.3/packages/starlight)

Updates `starlight-llms-txt` from 0.8.1 to 0.11.0
- [Release notes](https://github.com/delucis/starlight-llms-txt/releases)
- [Changelog](https://github.com/delucis/starlight-llms-txt/blob/main/packages/starlight-llms-txt/CHANGELOG.md)
- [Commits](https://github.com/delucis/starlight-llms-txt/commits/starlight-llms-txt@0.11.0/packages/starlight-llms-txt)

---
updated-dependencies:
- dependency-name: astro
  dependency-version: 7.1.3
  dependency-type: direct:production
- dependency-name: "@astrojs/starlight"
  dependency-version: 0.41.3
  dependency-type: direct:production
- dependency-name: starlight-llms-txt
  dependency-version: 0.11.0
  dependency-type: direct:production
...

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Author: dependabot[bot]