Ignore the newly added specification property in the test suite cases.

For now we do nothing with this, maybe at some point there will be some
way it's useful to use in Bowtie itself.

Refs: json-schema-org/JSON-Schema-Test-Suite#726

Author: Julian

bowtie/_suite.py

@@ -178,6 +178,7 @@ def cases_from(
         for case in json.loads(path.read_text()):
             for test in case["tests"]:
                 test["instance"] = test.pop("data")
+            case.pop("specification", None)  # we do nothing with this now
             yield _core.TestCase.from_dict(
                 dialect=dialect,
                 registry=registry,