meraki-code/meraki_cloud_simulator/merakicloudsimulator/webhooksimulator.py and meraki-code/meraki_cloud_simulator/merakicloudsimulator/ locationscanningsimulator.py are broken with python version 3.9.1

[culgb]

It seems to me that they are using the deprecated method threading.Thread.isAlive() instead of the new threading.Thread.is_alive()

[annegentle]

@shweta-palande Can you take a look? Thanks.