Bump the astro group across 1 directory with 4 updates

Bumps the astro group with 4 updates in the / directory: [@astrojs/sitemap](https://github.com/withastro/astro/tree/HEAD/packages/integrations/sitemap), [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro), [@astrojs/check](https://github.com/withastro/language-tools/tree/HEAD/packages/astro-check) and [astro-purgecss](https://github.com/codiume/orbit/tree/HEAD/packages/astro-purgecss).


Updates `@astrojs/sitemap` from 3.1.6 to 3.2.1
- [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/[email protected]/packages/integrations/sitemap)

Updates `astro` from 4.11.3 to 4.16.8
- [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/[email protected]/packages/astro)

Updates `@astrojs/check` from 0.7.0 to 0.9.4
- [Release notes](https://github.com/withastro/language-tools/releases)
- [Changelog](https://github.com/withastro/language-tools/blob/main/packages/astro-check/CHANGELOG.md)
- [Commits](https://github.com/withastro/language-tools/commits/@astrojs/[email protected]/packages/astro-check)

Updates `astro-purgecss` from 4.1.1 to 4.6.1
- [Release notes](https://github.com/codiume/orbit/releases)
- [Changelog](https://github.com/codiume/orbit/blob/main/packages/astro-purgecss/CHANGELOG.md)
- [Commits](https://github.com/codiume/orbit/commits/[email protected]/packages/astro-purgecss)

---
updated-dependencies:
- dependency-name: "@astrojs/sitemap"
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: astro
- dependency-name: astro
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: astro
- dependency-name: "@astrojs/check"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: astro
- dependency-name: astro-purgecss
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: astro
...

Signed-off-by: dependabot[bot] <[email protected]>