fix issue plotly#3403 deprecated numpy.bool

Author: lucafs

packages/python/plotly/plotly/express/_imshow.py

@@ -346,7 +346,7 @@ def imshow(
         binary_string = img.ndim >= (3 + slice_dimensions) and not is_dataframe
 
     # Cast bools to uint8 (also one byte)
-    if img.dtype == np.bool:
+    if img.dtype == np.bool_:
         img = 255 * img.astype(np.uint8)
 
     if range_color is not None: