Log Message:
py-jsonschema: updated to 4.16.0

v4.16.0
=======
* Improve the base URI behavior when resolving a ``$ref`` to a resolution URI
  which is different from the resolved schema's declared ``$id``.
* Accessing ``jsonschema.draftN_format_checker`` is deprecated. Instead, if you
  want access to the format checker itself, it is exposed as
  ``jsonschema.validators.DraftNValidator.FORMAT_CHECKER`` on any
  ``jsonschema.protocols.Validator``.