Bump newsroom-core from 0686e3a to 6cec593 in /client (#207)

Bumps [newsroom-core](https://github.com/superdesk/newsroom-core) from `0686e3a` to `6cec593`.
- [Release notes](https://github.com/superdesk/newsroom-core/releases)
- [Commits](superdesk/newsroom-core@0686e3a...6cec593)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>