Bump superdesk-publisher from v2.6.3 to v2.7.0 in /client

Bumps [superdesk-publisher](https://github.com/superdesk/superdesk-publisher) from v2.6.3 to v2.7.0.
- [Release notes](https://github.com/superdesk/superdesk-publisher/releases)
- [Changelog](https://github.com/superdesk/superdesk-publisher/blob/master/CHANGELOG.md)
- [Commits](superdesk/superdesk-publisher@24096d5...c3d4df0)

---
updated-dependencies:
- dependency-name: superdesk-publisher
  dependency-type: direct:production
...

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