fix bug, import sleep for in dynasolver.py

Author: zhangzhanqun

src/ansys/dyna/core/solver/dynasolver.py

@@ -16,6 +16,7 @@
 
 from . import grpc_tags as tag
 from .launcher import *  # noqa : F403
+from time import sleep
 
 #
 # Define our own exceptions