Simultaneously uploading multiple sketch maps (4x24) leads to sigkill

When sedning multiple (in this case 16) sketch maps with OSM background to digitize locally, it runs after ~12 mins into this error:
```
ERROR - request.py - on_failure - Task handler raised error: WorkerLostError('Worker exited prematurely: signal 9 (SIGKILL) Job: 5.')
sketch-map-tool-celery-1 | Traceback (most recent call last):
sketch-map-tool-celery-1 | File "/home/smt/.conda/envs/smt/lib/python3.11/site-packages/billiard/pool.py", line 1264, in mark_as_worker_lost
sketch-map-tool-celery-1 | raise WorkerLostError(
sketch-map-tool-celery-1 | billiard.einfo.ExceptionWithTraceback:
sketch-map-tool-celery-1 | """
sketch-map-tool-celery-1 | Traceback (most recent call last):
sketch-map-tool-celery-1 | File "/home/smt/.conda/envs/smt/lib/python3.11/site-packages/billiard/pool.py", line 1264, in mark_as_worker_lost
sketch-map-tool-celery-1 | raise WorkerLostError(
sketch-map-tool-celery-1 | billiard.exceptions.WorkerLostError: Worker exited prematurely: signal 9 (SIGKILL) Job: 5.
sketch-map-tool-celery-1 | """
```