Bump superdesk-planning from 0f6cda1 to 8794d37 in /client

Bumps [superdesk-planning](https://github.com/superdesk/superdesk-planning) from `0f6cda1` to `8794d37`.
- [Release notes](https://github.com/superdesk/superdesk-planning/releases)
- [Commits](superdesk/superdesk-planning@0f6cda1...8794d37)

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

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