Bump twig/markdown-extra from 3.3.8 to 3.4.0

Bumps [twig/markdown-extra](https://github.com/twigphp/markdown-extra) from 3.3.8 to 3.4.0.
- [Release notes](https://github.com/twigphp/markdown-extra/releases)
- [Commits](twigphp/markdown-extra@v3.3.8...v3.4.0)

---
updated-dependencies:
- dependency-name: twig/markdown-extra
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]