build(deps): bump prosemirror-schema-list from 1.3.0 to 1.4.0 (#336)

Bumps [prosemirror-schema-list](https://github.com/prosemirror/prosemirror-schema-list) from 1.3.0 to 1.4.0.
- [Changelog](https://github.com/ProseMirror/prosemirror-schema-list/blob/master/CHANGELOG.md)
- [Commits](ProseMirror/prosemirror-schema-list@1.3.0...1.4.0)

---
updated-dependencies:
- dependency-name: prosemirror-schema-list
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>