Update dependency kubernetes to v19

This MR contains the following updates:

Package	Update	Change
kubernetes	major	==18.20.0 -> ==19.15.0

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Release Notes

kubernetes-client/python

v19.15.0

Compare Source

Kubernetes API Version: v1.19.15

Feature

• The new parameter 'no_proxy' has been added to configuration for the REST and websocket client. (kubernetes-client/python#​1579, @​itaru2622)//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))//github.com/itaru2622))

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