fix: memory must be integer

Author: ftschirpke

wfcommons/wfbench/bench.py

@@ -145,7 +145,7 @@ def create_benchmark_from_synthetic_workflow(
                 task_gpu_work = int(task_gpu_work)
             else:
                 task_gpu_work = None
-            task_memory = mem * runtime_factor if mem else None
+            task_memory = int(mem * runtime_factor) if mem else None
             self._set_argument_parameters(
                 task,
                 task_percent_cpu,