.gitlab-ci.yml: remove -j4 parallelization

6 jobs for master in 160 minutes and 24 seconds (queued for 5 seconds)
Status Job ID Name Coverage
  Fast
passed #10109
test-fast

00:32:54

 
  Normal
failed #10112
test-filenotify-gio

01:34:32

passed #10113
test-gnustep

02:07:25

passed #10110
test-lisp

01:04:05

passed #10111
test-net

01:13:35

 
  Slow
skipped #10114
test-all
 
Name Stage Failure
failed
test-filenotify-gio Normal

2 skipped results:
SKIPPED file-notify-test10-sufficient-resources
SKIPPED file-notify-test10-sufficient-resources-remote

make[1]: Leaving directory '/checkout/test'
make: Leaving directory '/checkout/test'
Cleaning up file based variables
ERROR: Job failed: exit code 2