Use a more generic test for path item object's operations
Use a more generic test for path item object's operations

Get the list of allowed operations from openapi_spec_validator:
https://github.com/p1c2u/openapi-spec-validator/blob/b2e439aa79c7cde932f9926f1ae124556924b10d/openapi_spec_validator/validators.py#L157

p1c2u/openapi-core