cmark.ex

543607e2 - Bump actions/checkout from 2 to 2.3.4

Bump actions/checkout from 2 to 2.3.4 Bumps [actions/checkout](https://github.com/actions/checkout) from 2 to 2.3.4. - [Release notes](https://github.com/actions/checkout/releases) - [Changelog](https://github.com/actions/checkout/blob/main/CHANGELOG.md) - [Commits](https://github.com/actions/checkout/compare/v2...v2.3.4) Signed-off-by: dependabot[bot] <support@github.com>