Bump newsroom-core from 967e9c1 to b8a2658 in /client

Bumps [newsroom-core](https://github.com/superdesk/newsroom-core) from `967e9c1` to `b8a2658`.
- [Release notes](https://github.com/superdesk/newsroom-core/releases)
- [Commits](superdesk/newsroom-core@967e9c1...b8a2658)

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

Signed-off-by: dependabot[bot] <[email protected]>