Regression from breaking change in jsonschema v4.10.0

[matthewfeickert]

There is a breaking change in jsonschema v4.10.0 that is causing a regression with yadage-schemas v0.10.7. Running the examples of https://gitlab.cern.ch/recast-atlas/examples/helloworld with the local backend without

python -m pip install --upgrade 'recast-atlas[local]' 'jsonschema<=4.9.1'

results in an error for yadage-schemas 0.10.7 of

2023-02-08 02:23:59,617 | packtivity.asyncback |   INFO | configured pool size to 16
2023-02-08 02:23:59,649 | recastatlas.subcomma |  ERROR | caught exception
Traceback (most recent call last):
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/recastatlas/backends/local.py", line 21, in run_workflow
    run_workflow(**spec)
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/yadage/steering_api.py", line 19, in run_workflow
    with steering_ctx(*args, **kwargs):
  File "/home/feickert/.pyenv/versions/3.10.4/lib/python3.10/contextlib.py", line 135, in __enter__
    return next(self.gen)
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/yadage/steering_api.py", line 89, in steering_ctx
    ys = YadageSteering.create(
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/yadage/steering_object.py", line 65, in create
    ctrl = creators["local"](**kw)
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/yadage/creators.py", line 58, in local_workflows
    workflow_json = workflow_loader.workflow(
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/yadage/workflow_loader.py", line 29, in workflow
    data = yadageschemas.load(
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/yadageschemas/__init__.py", line 13, in load
    validate_spec(data,validopts)
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/yadageschemas/validator.py", line 13, in validate_spec
    return validator(**validopts).validate(data)
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/jsonschema/validators.py", line 283, in validate
    raise error
jsonschema.exceptions.ValidationError: ['init'] is not of type 'object'

Failed validating 'type' in schema['properties']['stages']['items']['properties']['dependencies']:
    {'default': {'dependency_type': 'jsonpath_ready', 'expressions': []},
     'oneOf': [{'$ref': 'predicates/jsonpathready-schema.json#'},
               {'$ref': 'predicates/exprfulfilled-schema.json#'}],
     'type': 'object'}

On instance['stages'][0]['dependencies']:
    ['init']

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/recastatlas/subcommands/run.py", line 56, in run
    run_sync(name, spec, backend=backend)
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/recastatlas/backends/__init__.py", line 77, in run_sync
    BACKENDS[backend].run_workflow(name, spec)
  File "/home/feickert/.pyenv/versions/recast-helloworld-dev/lib/python3.10/site-packages/recastatlas/backends/local.py", line 23, in run_workflow
    raise FailedRunException
recastatlas.exceptions.FailedRunException
Error: Workflow failed
Exception ignored in: <function Pool.__del__ at 0x7f5dbd4064d0>
Traceback (most recent call last):
  File "/home/feickert/.pyenv/versions/3.10.4/lib/python3.10/multiprocessing/pool.py", line 268, in __del__
    self._change_notifier.put(None)
  File "/home/feickert/.pyenv/versions/3.10.4/lib/python3.10/multiprocessing/queues.py", line 378, in put
    self._writer.send_bytes(obj)
  File "/home/feickert/.pyenv/versions/3.10.4/lib/python3.10/multiprocessing/connection.py", line 205, in send_bytes
    self._send_bytes(m[offset:offset + size])
  File "/home/feickert/.pyenv/versions/3.10.4/lib/python3.10/multiprocessing/connection.py", line 416, in _send_bytes
    self._send(header + buf)
  File "/home/feickert/.pyenv/versions/3.10.4/lib/python3.10/multiprocessing/connection.py", line 373, in _send
    n = write(self._handle, buf)
OSError: [Errno 9] Bad file descriptor