[unittest] Fixed NPY002 error

Author: cmastalli

unittest/python/test_std_vector.py

@@ -102,7 +102,7 @@ def checkZero(v):
 # Test slicing
 l6 = eigenpy.StdVec_VectorXd()
 for _ in range(4):
-    l6.append(np.random.randn(3))
+    l6.append(rng.random(3))
 checkAllValues(l6[:1], l6.tolist()[:1])
 checkAllValues(l6[1:], l6.tolist()[1:])
 checkAllValues(l6[:-1], l6.tolist()[:-1])