Update packages/bigframes/third_party/bigframes_vendored/ibis/expr/operations/ai_ops.py

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: sycai

packages/bigframes/third_party/bigframes_vendored/ibis/expr/operations/ai_ops.py

@@ -176,7 +176,7 @@ class AIScore(Value):
     shape = rlz.shape_like("prompt")
 
     @attribute
-    def dtype(self) -> dt.Struct:
+    def dtype(self) -> dt.DataType:
         return dt.float64