Bump superdesk-planning from b6e2d27 to 90acef8 in /client

Bumps [superdesk-planning](https://github.com/superdesk/superdesk-planning) from `b6e2d27` to `90acef8`.
- [Release notes](https://github.com/superdesk/superdesk-planning/releases)
- [Commits](superdesk/superdesk-planning@b6e2d27...90acef8)

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

Signed-off-by: dependabot[bot] <support@github.com>