increase allowed delay for parallel task start time in test_execute_t…

…ask_graph

tests/experiments/test_ray.py

@@ -31,7 +31,7 @@ def test_execute_task_graph():
     # Verify that parallel tasks (task2 and task3) started within a short time of each other
     parallel_start_diff = abs(exp_args_list[1].start_time - exp_args_list[2].start_time)
     print(f"parallel_start_diff: {parallel_start_diff}")
-    assert parallel_start_diff < 1.5  # Allow for a small delay
+    assert parallel_start_diff < 2  # Allow for a small delay
 
     # Ensure that the entire task graph took the expected amount of time
     total_time = exp_args_list[-1].end_time - exp_args_list[0].start_time