python-jsonschema/jsonschema v4.17.3

on GitHub

• Fix instantiating validators with cached refs to boolean schemas
  rather than objects (#1018).
• Empty strings are not valid relative JSON Pointers (aren't valid under the
  RJP format).
• Durations without (trailing) units are not valid durations (aren't
  valid under the duration format). This involves changing the dependency
  used for validating durations (from isoduration to isodate).

Full Changelog: v4.17.2...v4.17.3