gitlab-ci: Call renamed check target

.gitlab-ci.yml:
Change the called make target in the gitlab CI check target to `check` (it has been renamed from `lint`).
7 jobs for issues/47 in 31 minutes and 31 seconds (queued for 6 seconds)
latest
Status Name Job ID Coverage
  Check
passed check #30416

00:00:13

 
  Build
passed build_long: [baseline iso] #30419
fast-single-thread

00:16:30

passed build_long: [baseline netboot] #30420
fast-single-thread

00:17:10

passed build_long: [releng iso] #30421
fast-single-thread

00:30:38

passed build_long: [releng netboot] #30422
fast-single-thread

00:31:15

passed build_short: [baseline bootstrap] #30417

00:13:11

passed build_short: [releng bootstrap] #30418

00:13:02