rororo should require jsonschema <= 4.17.3

[playpauseandstop]

As jsonschema==~4.18 will result in,

  File ".venv/lib/python3.11/site-packages/rororo/__init__.py", line 15, in <module>
    from rororo.openapi import (
  File ".venv/lib/python3.11/site-packages/rororo/openapi/__init__.py", line 11, in <module>
    from rororo.openapi.contexts import openapi_context
  File ".venv/lib/python3.11/site-packages/rororo/openapi/contexts.py", line 6, in <module>
    from rororo.openapi.data import OpenAPIContext
  File ".venv/lib/python3.11/site-packages/rororo/openapi/data.py", line 15, in <module>
    from openapi_core.validation.request.datatypes import RequestParameters
  ...
  File ".venv/lib/python3.11/site-packages/openapi_schema_validator/validators.py", line 11, in <module>
    meta_schema=_utils.load_schema("draft4"),
                ^^^^^^^^^^^^^^^^^^
AttributeError: module 'jsonschema._utils' has no attribute 'load_schema'

And jsonschema==~4.19 will result in,

  ...
  File ".venv/lib/python3.11/site-packages/openapi_schema_validator/validators.py", line 3, in <module>
    from jsonschema import _legacy_validators, _utils, _validators
ImportError: cannot import name '_legacy_validators' from 'jsonschema' (/Users/idavydenko/Projects/playpauseandstop/igordavydenko/.venv/lib/python3.11/site-packages/jsonschema/__init__.py)

[Julian]

Hi. I happen to be seeing this issue while doing a general GitHub search -- can I ask if there's anything I can do to make it even clearer that these are private and can change without warning? They follow Python conventions (beginning with an underscore) -- and they also have trivial replacements (specifically the VALIDATORS attribute on a Validator is the way to access functions which validate particular keywords, and there's no reason to call load_schema outside of the package itself, you should use importlib.resources).

It's the first time seeing this package (congrats on writing it) -- so just my 0.02, but I wouldn't be trying to pin jsonschema from above if it were me, I'd simply ensure you were using public APIs instead of private ones. Happy to answer questions if needed.