Update deprecated numpy method calls

`numpy.product` was deprecated in favor of `numpy.prod`.

Author: cgorman

src/dicomweb_client/file.py

@@ -857,7 +857,7 @@ def _update_db(self):
                                 getattr(ds, 'NumberOfFrames', '1')
                             ),
                             number_of_pixels_per_frame=int(
-                                np.product([
+                                np.prod([
                                     ds.Rows,
                                     ds.Columns,
                                     ds.SamplesPerPixel,
@@ -2027,7 +2027,7 @@ def insert_instances(
                                 getattr(ds, 'NumberOfFrames', '1')
                             ),
                             number_of_pixels_per_frame=int(
-                                np.product([
+                                np.prod([
                                     ds.Rows,
                                     ds.Columns,
                                     ds.SamplesPerPixel