Update l5pc example benchmark for numpy.float deprecation

Author: musicinmybrain

examples/l5pc/benchmark/task_stats.py

@@ -71,7 +71,7 @@ def plot_duration_histogram(tasks):
     durations = np.fromiter((t['duration']
                              for task_list in tasks.values()
                              for t in task_list),
-                            dtype=np.float)
+                            dtype=np.float64)
     plt.hist(durations, 100, range=(1, 160))
 
     plt.xlabel('Duration (s)')