fix: use BIDS schema validator

This schema validator have format validation
enabled which is needed to correctly validate
a BIDS schema against the meta schema

Author: candleindark

tools/schemacode/src/bidsschematools/schema.py

@@ -9,7 +9,7 @@
 from functools import cache, lru_cache
 from importlib.resources import files
 
-from jsonschema import ValidationError, validate
+from jsonschema import ValidationError
 from jsonschema.protocols import Validator as JsonschemaValidator
 
 from . import __bids_version__, __version__, utils
@@ -301,12 +301,11 @@ def filter_schema(schema, **kwargs):
 
 def validate_schema(schema: Namespace):
     """Validate a schema against the BIDS metaschema."""
-    metaschema = json.loads(files("bidsschematools.data").joinpath("metaschema.json").read_text())
 
     # validate is put in this try/except clause because the error is sometimes too long to
     # print in the terminal
     try:
-        validate(instance=schema.to_dict(), schema=metaschema)
+        get_schema_validator().validate(instance=schema.to_dict())
     except ValidationError as e:
         with tempfile.NamedTemporaryFile(
             prefix="schema_error_", suffix=".txt", delete=False, mode="w+"