update references to deprecated pydantic V2

Author: saunack-shapley

src/parallel/_compat.py

@@ -166,15 +166,15 @@ def model_parse(model: type[_ModelT], data: Any) -> _ModelT:
 
 
 def model_parse_json(model: type[_ModelT], data: str | bytes) -> _ModelT:
-    if PYDANTIC_V2:
-        return model.model_validate_json(data)
-    return model.parse_raw(data)  # pyright: ignore[reportDeprecated]
+    if PYDANTIC_V1:
+        return model.parse_raw(data)  # pyright: ignore[reportDeprecated]
+    return model.model_validate_json(data)
 
 
 def model_json_schema(model: type[_ModelT]) -> dict[str, Any]:
-    if PYDANTIC_V2:
-        return model.model_json_schema()
-    return model.schema()  # pyright: ignore[reportDeprecated]
+    if PYDANTIC_V1:
+        return model.schema()  # pyright: ignore[reportDeprecated]
+    return model.model_json_schema()
 
 
 # generic models

src/parallel/lib/_pydantic.py

@@ -6,7 +6,7 @@
 
 import pydantic
 
-from .._compat import PYDANTIC_V2, model_json_schema
+from .._compat import PYDANTIC_V1, model_json_schema
 
 
 def to_json_schema(
@@ -16,8 +16,8 @@ def to_json_schema(
     if is_basemodel_type(model_type):
         schema = model_json_schema(model_type)
     elif isinstance(model_type, pydantic.TypeAdapter):
-        if not PYDANTIC_V2:
-            raise TypeError(f"TypeAdapters are only supported with Pydantic v2 - {model_type}")
+        if PYDANTIC_V1:
+            raise TypeError(f"TypeAdapters are not supported with Pydantic v1 - {model_type}")
         schema = model_type.json_schema()
     else:
         raise TypeError(f"Unsupported type: {model_type}")