Bump superdesk-planning from 0cd2a63 to a667558 in /client

Bumps [superdesk-planning](https://github.com/superdesk/superdesk-planning) from `0cd2a63` to `a667558`.
- [Release notes](https://github.com/superdesk/superdesk-planning/releases)
- [Commits](superdesk/superdesk-planning@0cd2a63...a667558)

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

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