zhoulinhui 6c1399d078 Update py37 to py38 for running-tests.rst
It should been done in https://review.opendev.org/#/c/752436/ but missing

Change-Id: Iae22e8d8133afecd7e897f82ca58afd6ea33e1c0
2020-09-18 00:57:13 +08:00
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