Bump markdown-it and @11ty/eleventy

Bumps [markdown-it](https://github.com/markdown-it/markdown-it) and [@11ty/eleventy](https://github.com/11ty/eleventy). These dependencies needed to be updated together.

Updates `markdown-it` from 10.0.0 to 12.3.2
- [Release notes](https://github.com/markdown-it/markdown-it/releases)
- [Changelog](https://github.com/markdown-it/markdown-it/blob/master/CHANGELOG.md)
- [Commits](markdown-it/markdown-it@10.0.0...12.3.2)

Updates `@11ty/eleventy` from 0.12.1 to 1.0.2
- [Release notes](https://github.com/11ty/eleventy/releases)
- [Changelog](https://github.com/11ty/eleventy/blob/master/docs/release-instructions.md)
- [Commits](11ty/eleventy@v0.12.1...v1.0.2)

---
updated-dependencies:
- dependency-name: markdown-it
  dependency-type: indirect
- dependency-name: "@11ty/eleventy"
  dependency-type: direct:development
...

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