bump py37 to py38 in tox.ini
in 'victoria' cycle, we should test py38 by default. also remove unused env pypy Trivial change Change-Id: Iafaa88482bf5e972e1c0eb9766254d3973685368
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in 'victoria' cycle, we should test py38 by default. also remove unused env pypy Trivial change Change-Id: Iafaa88482bf5e972e1c0eb9766254d3973685368