Bump newsroom-core from 3ecdc1f to 1575f91 in /client

Bumps [newsroom-core](https://github.com/superdesk/newsroom-core) from `3ecdc1f` to `1575f91`.
- [Release notes](https://github.com/superdesk/newsroom-core/releases)
- [Commits](superdesk/newsroom-core@3ecdc1f...1575f91)

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

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