fix / update the .gitlab-ci.yml (python 3.5 -> 3.7)

update install_requires package versions
4 jobs for master in 3 minutes and 47 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #89581
test build

00:00:28

 
  Test
passed #89583
test latest requirements

00:01:59

passed #89584
test packaging

00:03:19

passed #89582
test stable requirements

00:02:03