Resolve deprecation warning for remote references in JSONSchema validator :: datagov-harvesting-logic

[btylerburton]

This bug occurs when running tests in the datagov-harvesting-logic repository.

How to reproduce

1. Install required dependencies
2. Run tests, via make test

Expected behavior

Observe passing tests and no warning

Actual behavior

Observe warning about remote references that will soon become an error:

tests/validate/dcatus/test_dcat_us.py: 30 warnings
  /Users/brendantburton/Repos/datagov-harvesting-logic/.venv/lib/python3.10/site-packages/jsonschema/_keywords.py:295: 
DeprecationWarning: Automatically retrieving remote references can be a security vulnerability 
and is discouraged by the JSON Schema specifications. Relying on this behavior is deprecated 
and will shortly become an error. If you are sure you want to remotely retrieve your 
reference and that it is safe to do so, you can find instructions for doing so 
via referencing.Registry in the referencing documentation (https://referencing.readthedocs.org).
    yield from validator.descend(

Sketch

• Follow documentation provided at https://referencing.readthedocs.org for how to remove this warning.