[fix] compatibility from the latest silx version. Remove six import from silx

1 job for fix_ci in 1 minute and 58 seconds (queued for 7 minutes and 2 seconds)
Status Name Job ID Coverage
  Test
failed test:python3.5-stretch-pyqt5 #25456

00:01:58

 
Name Stage Failure
failed
test:python3.5-stretch-pyqt5 Test
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