Added waitall to avoid crash when memory usage increases due to the asynchronous MXNet api

2 jobs for develop in 20 seconds (queued for 3 seconds)
Status Name Job ID Coverage
failed masterJobWindows #548861


skipped BranchJobLinux #548862
Name Stage Failure
masterJobWindows Windows There is an unknown failure, please try again
[ERROR] /C:/gitlabRunner/builds/13f67bce/0/monticore/EmbeddedMontiArc/generators/CNNArch2Gluon/src/main/java/de/monticore/lang/monticar/cnnarch/gluongenerator/[46,5] method does not override or implement a method from a supertype
[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]
ERROR: Job failed: exit status 1