Bump pandoc from 2.3 to 2.4

Bumps [pandoc](https://github.com/boisgera/pandoc) from 2.3 to 2.4.
- [Release notes](https://github.com/boisgera/pandoc/releases)
- [Changelog](https://github.com/boisgera/pandoc/blob/master/mkdocs/changelog.md)
- [Commits](boisgera/pandoc@v2.3...v2.4)

---
updated-dependencies:
- dependency-name: pandoc
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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