chore(deps): bump the npm group with 3 updates

Bumps the npm group with 3 updates: [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap), [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) and [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro).


Updates `@astrojs/sitemap` from 3.6.0 to 3.6.1
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/sitemap/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/sitemap@3.6.1/packages/integrations/sitemap)

Updates `@astrojs/starlight` from 0.37.1 to 0.37.2
- [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@0.37.2/packages/starlight)

Updates `astro` from 5.16.6 to 5.16.8
- [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@5.16.8/packages/astro)

---
updated-dependencies:
- dependency-name: "@astrojs/sitemap"
  dependency-version: 3.6.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: "@astrojs/starlight"
  dependency-version: 0.37.2
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: astro
  dependency-version: 5.16.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
...

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Author: dependabot[bot]