Bump panoptes-client from 5.5.8 to 5.6.0

Bumps [panoptes-client](https://github.com/zooniverse/panoptes-javascript-client) from 5.5.8 to 5.6.0.
- [Release notes](https://github.com/zooniverse/panoptes-javascript-client/releases)
- [Changelog](https://github.com/zooniverse/panoptes-javascript-client/blob/main/CHANGELOG.md)
- [Commits](zooniverse/panoptes-javascript-client@v5.5.8...v5.6.0)

---
updated-dependencies:
- dependency-name: panoptes-client
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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