[test labels] Fix plural in variable name.

20 jobs for master in 81 minutes and 48 seconds (queued for 4 seconds)
Status Job ID Name Coverage
  Stage0
passed #6009
pull base distributions

00:00:24

 
  Stage1
passed #6014
base:10

00:05:51

passed #6015
base:16.04

00:07:20

passed #6016
base:18.04

00:07:15

passed #6012
base:8

00:05:18

passed #6013
base:9

00:05:15

passed #6010
docker-builder

00:00:54

passed #6011
proxy

00:00:43

 
  Stage2
passed #6017
base:8-backports

00:01:01

passed #6018
dune:2.3

00:00:52

passed #6019
dune:2.4

00:00:37

passed #6028
dune:2.5

00:15:33

passed #6021
dune:2.6

00:12:12

passed #6022
dune:git

00:09:04

failed #6020
dune:2.5

00:00:09

 
  Stage3
passed #6023
dune-fufem:2.4

00:03:24

passed #6024
dune-fufem:git

00:05:01

passed #6025
dune-pdelab-deps:2.6

00:02:40

passed #6026
dune-pdelab-deps:git

00:02:13

 
  Publish
passed #6027
publish

00:35:48