AttributeError: module 'jsonref' has no attribute 'JsonLoader'

[cedk]

Since gazpachoking/jsonref#43 jsonref does not have anymore JsonLoader class.

Traceback (most recent call last):
  File "/usr/local/lib/python3.10/site-packages/sphinx/cmd/build.py", line 276, in build_main
    app = Sphinx(args.sourcedir, args.confdir, args.outputdir,
  File "/usr/local/lib/python3.10/site-packages/sphinx/application.py", line 223, in __init__
    self.setup_extension(extension)
  File "/usr/local/lib/python3.10/site-packages/sphinx/application.py", line 398, in setup_extension
    self.registry.load_extension(self, extname)
  File "/usr/local/lib/python3.10/site-packages/sphinx/registry.py", line 459, in load_extension
    mod = import_module(extname)
  File "/usr/local/lib/python3.10/importlib/__init__.py", line 126, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1050, in _gcd_import
  File "<frozen importlib._bootstrap>", line 1027, in _find_and_load
  File "<frozen importlib._bootstrap>", line 1006, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 688, in _load_unlocked
  File "<frozen importlib._bootstrap_external>", line 883, in exec_module
  File "<frozen importlib._bootstrap>", line 241, in _call_with_frames_removed
  File "/usr/local/lib/python3.10/site-packages/sphinxcontrib/jsonschema.py", line 37, in <module>
    class CustomJsonrefLoader(jsonref.JsonLoader):
AttributeError: module 'jsonref' has no attribute 'JsonLoader'

[Bjwebb]

This will be fixed by #41