Bump newsroom-core from ff2815d to 3d903ca in /client

Bumps [newsroom-core](https://github.com/superdesk/newsroom-core) from `ff2815d` to `3d903ca`.
- [Release notes](https://github.com/superdesk/newsroom-core/releases)
- [Commits](superdesk/newsroom-core@ff2815d...3d903ca)

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

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