chore(deps-dev): bump astro, @astrojs/mdx and astro-auto-import

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

Updates `astro` from 5.13.5 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/mdx` from 4.3.4 to 7.0.3
- [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/mdx@7.0.3/packages/integrations/mdx)

Updates `astro-auto-import` from 0.4.4 to 0.5.2
- [Release notes](https://github.com/delucis/astro-auto-import/releases)
- [Changelog](https://github.com/delucis/astro-auto-import/blob/main/packages/astro-auto-import/CHANGELOG.md)
- [Commits](https://github.com/delucis/astro-auto-import/commits/astro-auto-import@0.5.2/packages/astro-auto-import)

---
updated-dependencies:
- dependency-name: "@astrojs/mdx"
  dependency-version: 7.0.3
  dependency-type: direct:development
- dependency-name: astro
  dependency-version: 7.1.3
  dependency-type: direct:development
- dependency-name: astro-auto-import
  dependency-version: 0.5.2
  dependency-type: direct:development
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]