FIX Adjust rf leak pytest margin

python/cuml/tests/test_random_forest.py

@@ -1193,7 +1193,7 @@ def test_rf_host_memory_leak(large_clf, estimator_type):
 
     # Some tiny allocations may occur, but we should not leak
     # without bounds, which previously happened
-    assert (final_mem - initial_baseline_mem) < 2e6
+    assert (final_mem - initial_baseline_mem) < 2.2e6
 
 
 @pytest.mark.memleak