Update .gitlab-ci.yml

1 job for dierkes in 40 seconds (queued for 2 seconds)
Status Job ID Name Coverage
failed BranchJobWindows #589900


Name Stage Failure
BranchJobWindows Windows There is an unknown failure, please try again
[ERROR]   location: class de.monticore.lang.monticar.generator.order.nfp.TagThresholdTagSchema.TagThresholdSymbolCreator
[ERROR] -> [Help 1]
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException
ERROR: Job failed: exit status 1