Bump panoptes-client from 5.5.5 to 5.5.6 (#551)

Bumps [panoptes-client](https://github.com/zooniverse/panoptes-javascript-client) from 5.5.5 to 5.5.6.
- [Release notes](https://github.com/zooniverse/panoptes-javascript-client/releases)
- [Changelog](https://github.com/zooniverse/panoptes-javascript-client/blob/master/CHANGELOG.md)
- [Commits](zooniverse/panoptes-javascript-client@v5.5.5...v5.5.6)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

package.json

@@ -45,7 +45,7 @@
     "grommet": "~1.13.0",
     "history": "~4.4.1",
     "markdownz": "~8.0.7",
-    "panoptes-client": "~5.5.5",
+    "panoptes-client": "~5.5.6",
     "prop-types": "~15.8.1",
     "react": "~16.14.0",
     "react-dom": "~16.14.0",