Bump @mdx-js/mdx from 1.6.22 to 3.1.1

Bumps [@mdx-js/mdx](https://github.com/mdx-js/mdx/tree/HEAD/packages/mdx) from 1.6.22 to 3.1.1.
- [Release notes](https://github.com/mdx-js/mdx/releases)
- [Changelog](https://github.com/mdx-js/mdx/blob/main/changelog.md)
- [Commits](https://github.com/mdx-js/mdx/commits/3.1.1/packages/mdx)

---
updated-dependencies:
- dependency-name: "@mdx-js/mdx"
  dependency-version: 3.1.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]