Bump superdesk-core from 6b75d6b to 89030e3 in /client (#334)

Bumps [superdesk-core](https://github.com/superdesk/superdesk-client-core) from `6b75d6b` to `89030e3`.
- [Release notes](https://github.com/superdesk/superdesk-client-core/releases)
- [Commits](superdesk/superdesk-client-core@6b75d6b...89030e3)

---
updated-dependencies:
- dependency-name: superdesk-core
  dependency-type: direct:production
...

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