feat(setup.py): increase cubicweb max version to 3.31.x

3 jobs for !29 with topic/default/set_cubes_cw_max_version in 2 minutes and 25 seconds (queued for 2 seconds)
latest detached
Status Name Job ID Coverage
  Lint
passed check-manifest #461451
lint check-manifest

00:00:39

passed flake8 #461450
lint flake8

00:00:39

 
  Tests
passed py3 #461452
tests py3

00:01:43