chore(deps-dev): bump the docs group across 1 directory with 5 updates

Bumps the docs group with 5 updates in the / directory:

| Package | From | To |
| --- | --- | --- |
| [@astrojs/check](https://github.com/withastro/language-tools/tree/HEAD/packages/astro-check) | `0.5.6` | `0.5.10` |
| [@astrojs/markdown-remark](https://github.com/withastro/astro/tree/HEAD/packages/markdown/remark) | `4.2.1` | `4.3.2` |
| [@astrojs/mdx](https://github.com/withastro/astro/tree/HEAD/packages/integrations/mdx) | `2.1.1` | `2.3.1` |
| [astro](https://github.com/withastro/astro/tree/HEAD/packages/astro) | `4.4.9` | `4.13.0` |
| [postcss](https://github.com/postcss/postcss) | `8.4.35` | `8.4.40` |



Updates `@astrojs/check` from 0.5.6 to 0.5.10
- [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 `@astrojs/markdown-remark` from 4.2.1 to 4.3.2
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/markdown/remark/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/markdown/remark)

Updates `@astrojs/mdx` from 2.1.1 to 2.3.1
- [Release notes](https://github.com/withastro/astro/releases)
- [Changelog](https://github.com/withastro/astro/blob/main/packages/integrations/mdx/CHANGELOG.md)
- [Commits](https://github.com/withastro/astro/commits/@astrojs/[email protected]/packages/integrations/mdx)

Updates `astro` from 4.4.9 to 4.13.0
- [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 `postcss` from 8.4.35 to 8.4.40
- [Release notes](https://github.com/postcss/postcss/releases)
- [Changelog](https://github.com/postcss/postcss/blob/main/CHANGELOG.md)
- [Commits](postcss/postcss@8.4.35...8.4.40)

---
updated-dependencies:
- dependency-name: "@astrojs/check"
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: docs
- dependency-name: "@astrojs/markdown-remark"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: docs
- dependency-name: "@astrojs/mdx"
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: docs
- dependency-name: astro
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: docs
- dependency-name: postcss
  dependency-type: direct:development
  update-type: version-update:semver-patch
  dependency-group: docs
...

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