add flaky to test_avg_std_and_npoints

Author: basnijholt

adaptive/tests/test_average_learner.py

@@ -1,5 +1,6 @@
 import random
 
+import flaky
 import numpy as np
 
 from adaptive.learner import AverageLearner
@@ -21,6 +22,7 @@ def test_only_returns_new_points():
     assert learner.ask(1)[0][0] == 10
 
 
+@flaky.flaky(max_runs=3)
 def test_avg_std_and_npoints():
     learner = AverageLearner(lambda x: x, atol=None, rtol=0.01)