build(deps): bump @contentful/rich-text-types from 16.3.5 to 16.4.0 (#2227)

Bumps [@contentful/rich-text-types](https://github.com/contentful/rich-text) from 16.3.5 to 16.4.0.
- [Release notes](https://github.com/contentful/rich-text/releases)
- [Changelog](https://github.com/contentful/rich-text/blob/master/CHANGELOG.md)
- [Commits](https://github.com/contentful/rich-text/compare/@contentful/rich-text-types@16.3.5...@contentful/rich-text-types@16.4.0)

---
updated-dependencies:
- dependency-name: "@contentful/rich-text-types"
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]