Update outdated default envlist
Python 3.9 is no longer supported. Also use non-versioned template which is consistently used in multiple repos. Developers can select specific version by adding -e . Change-Id: I4c9b142961b8491ec54bd6eafd8cbd7816087e98 Signed-off-by: Takashi Kajinami <kajinamit@oss.nttdata.com>
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