build(deps): bump prosemirror-transform from 1.10.2 to 1.12.0 (#512)

Bumps [prosemirror-transform](https://github.com/prosemirror/prosemirror-transform) from 1.10.2 to 1.12.0.
- [Changelog](https://github.com/ProseMirror/prosemirror-transform/blob/master/CHANGELOG.md)
- [Commits](ProseMirror/prosemirror-transform@1.10.2...1.12.0)

---
updated-dependencies:
- dependency-name: prosemirror-transform
  dependency-version: 1.12.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]