[ci] Test with dune 2.8 instead of dune 2.7

7 jobs for !2781 with feature/ci-use-dune-2.8 in 7 minutes and 40 seconds (queued for 11 seconds)
Child pipeline (parent) detached
Status Name Job ID Coverage
  Configure
passed configure #40581

00:03:07

 
  Linting
passed black (python) #40585

00:00:31

passed pylint-flake8 (python) #40587

00:01:12

 
  Select
passed select tests #40591

00:01:57

 
  Build
passed compile cpp #40593

00:00:52

 
  Test
passed test cpp #40594

00:01:10

passed test python #40595

00:00:44