[tox] Do not install Cubicweb 3.27 on Python 2

5 jobs for topic/default/tox-tests-py2-cw-version-fix in 2 minutes and 44 seconds (queued for 13 seconds)
latest
Status Name Job ID Coverage
  Test
passed flake8 #18514

00:00:20

passed py27 #18515

00:01:28

failed py3 #82564

00:01:15

failed py3 #18517

00:01:37

failed py3 #18516

00:02:53

 
Name Stage Failure
failed
py3 Test
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