Bump the npm group across 1 directory with 6 updates (#83)

Bumps the npm group with 6 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [@astrojs/rss](https://github.com/withastro/astro/tree/HEAD/packages/astro-rss) | `4.0.14` | `4.0.15` |
| [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap) | `3.6.1` | `3.7.0` |
| [@astrojs/starlight](https://github.com/withastro/starlight/tree/HEAD/packages/starlight) | `0.37.2` | `0.37.4` |
| [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) | `5.16.8` | `5.16.15` |
| [unist-util-visit](https://github.com/syntax-tree/unist-util-visit) | `5.0.0` | `5.1.0` |
| [prettier](https://github.com/prettier/prettier) | `3.7.4` | `3.8.1` |



Updates `@astrojs/rss` from 4.0.14 to 4.0.15
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/astro-rss/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/rss@4.0.15/packages/astro-rss)

Updates `@astrojs/sitemap` from 3.6.1 to 3.7.0
- [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@3.7.0/packages/integrations/sitemap)

Updates `@astrojs/starlight` from 0.37.2 to 0.37.4
- [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@0.37.4/packages/starlight)

Updates `astro` from 5.16.8 to 5.16.15
- [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@5.16.15/packages/astro)

Updates `unist-util-visit` from 5.0.0 to 5.1.0
- [Release notes](https://github.com/syntax-tree/unist-util-visit/releases)
- [Commits](syntax-tree/unist-util-visit@5.0.0...5.1.0)

Updates `prettier` from 3.7.4 to 3.8.1
- [Release notes](https://github.com/prettier/prettier/releases)
- [Changelog](https://github.com/prettier/prettier/blob/main/CHANGELOG.md)
- [Commits](prettier/prettier@3.7.4...3.8.1)

---
updated-dependencies:
- dependency-name: "@astrojs/rss"
  dependency-version: 4.0.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: "@astrojs/sitemap"
  dependency-version: 3.7.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm
- dependency-name: "@astrojs/starlight"
  dependency-version: 0.37.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: astro
  dependency-version: 5.16.15
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: npm
- dependency-name: unist-util-visit
  dependency-version: 5.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: npm
- dependency-name: prettier
  dependency-version: 3.8.1
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: npm
...

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Author: dependabot[bot]