Fix outdated default envlist
Python 3.9 is no longer supported. Use the unversioned template so that we don't have to update it when supported python versions are updated. Users can still require specific version by adding -e py3N to command line. Change-Id: I68843d249cb9458d2966b9309ece21337b80687d Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
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