fix: make transformer compatible with @tiptap/core@^2.0.0-beta.210 (#512)

* fix: make `transformer` compatible with `@tiptap/core@^2.0.0-beta.210`

* chore: bump `transformer` minimum `@tiptap/core` version to `2.0.0-beta.214`

* updates transformer deps @tiptap/core to latest 217

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Co-authored-by: Arnaud Thomas Desessarts <arnaud.thomas@novadiscovery.com>
Co-authored-by: Jan Thurau <jan@janthurau.de>

Author: 3 people