build: use new gitlab syntax for triggering other pipeline

12 jobs for branch/default in 2 minutes and 10 seconds (queued for 10 seconds)
Status Job ID Name Coverage
  Tests
passed #40440
black

00:00:25

passed #40439
check-manifest

00:00:25

passed #40438
flake8

00:00:40

passed #40441
mypy

00:00:39

passed #40437
py3

00:00:48

 
  After Tests
passed trigger-cubicweb-pipeline

passed trigger-logilab-constraint-pipeline

passed trigger-logilab-database-pipeline

failed trigger-logilab-mtconverter-pipeline

passed #40448
trigger-readthedocs

00:00:23

passed trigger-rql-pipeline

passed trigger-yams-pipeline