Update generate_types.sh

Author: holtskinner

scripts/generate_types.sh

@@ -22,6 +22,7 @@ uv run datamodel-codegen \
   --input-file-type jsonschema \
   --output "$GENERATED_FILE" \
   --target-python-version 3.10 \
+  --output-model-type pydantic_v2.BaseModel \
   --base-class a2a.utils.pydantic_base.A2ABaseModel \
   --disable-timestamp \
   --use-schema-description \