Bump newsroom-core from 08b2bdf to a8eb8a9 in /client (#92)

Bumps [newsroom-core](https://github.com/superdesk/newsroom-core) from `08b2bdf` to `a8eb8a9`.
- [Release notes](https://github.com/superdesk/newsroom-core/releases)
- [Commits](superdesk/newsroom-core@08b2bdf...a8eb8a9)

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

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