fix: remove redundant import

Author: justanotherbyte

autumn/models/entities.py

@@ -16,4 +16,3 @@ class Entity(BaseModel):
     products: List[CustomerProduct]
     features: Dict[str, CustomerFeature]
     invoices: Optional[List[CustomerInvoice]] = None
-

autumn/products.py

@@ -15,7 +15,6 @@
 from .models.meta import Empty
 from .models.products import FreeTrial, ProductItem
 from .models.response import (
-    CancelResponse,
     CreateProductResponse,
     GetProductResponse,
     ListProductResponse,