Update python versions for unit tests
This patch updates py37 to py38 in the default unit test environments. Change-Id: I776ae5c2ecf2d356959fd8ffbb5296c3b044edaf
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This patch updates py37 to py38 in the default unit test environments. Change-Id: I776ae5c2ecf2d356959fd8ffbb5296c3b044edaf