fix FACE_CONNECTIONS seems to be renamed/replaced by FACEMESH_TESSELATION.

app.py

@@ -34,7 +34,7 @@ def inference(image):
         mp_drawing.draw_landmarks(
             image=annotated_image, 
             landmark_list=results.face_landmarks, 
-            connections=mp_holistic.FACE_CONNECTIONS,
+            connections=mp_holistic.FACEMESH_TESSELATION,
             landmark_drawing_spec=drawing_spec,
             connection_drawing_spec=drawing_spec)
         mp_drawing.draw_landmarks(