Fix smithy-cbor spec and rbs

Author: Matt Muller

gems/smithy-cbor/lib/smithy-cbor/deserializer.rb

@@ -15,7 +15,7 @@ def initialize(options = {})
       def deserialize(shape, bytes, target)
         return {} if bytes.empty?
 
-        ref = shape.is_a?(ShapeRef) ? shape : ShapeRef.new(target: shape)
+        ref = shape.is_a?(ShapeRef) ? shape : ShapeRef.new(shape: shape)
         shape(ref, CBOR.decode(bytes), target)
       end
 

gems/smithy-cbor/lib/smithy-cbor/serializer.rb

@@ -13,7 +13,7 @@ def initialize(options = {})
       end
 
       def serialize(shape, data)
-        ref = shape.is_a?(ShapeRef) ? shape : ShapeRef.new(target: shape)
+        ref = shape.is_a?(ShapeRef) ? shape : ShapeRef.new(shape: shape)
         return nil if ref.shape == Prelude::Unit
 
         CBOR.encode(shape(ref, data))