Bump newsroom-core from fd026e8 to 13086c4 in /client

Bumps [newsroom-core](https://github.com/superdesk/newsroom-core) from `fd026e8` to `13086c4`.
- [Release notes](https://github.com/superdesk/newsroom-core/releases)
- [Commits](superdesk/newsroom-core@fd026e8...13086c4)

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

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