Bump superdesk-core from 2d1a692 to 83a3cfa in /client (#487)

Bumps [superdesk-core](https://github.com/superdesk/superdesk-client-core) from `2d1a692` to `83a3cfa`.
- [Release notes](https://github.com/superdesk/superdesk-client-core/releases)
- [Commits](superdesk/superdesk-client-core@2d1a692...83a3cfa)

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

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