Fix type for numpy random in tests

Author: WardBrian

test/test_cmdstan_args.py

@@ -345,7 +345,7 @@ def test_args_good() -> None:
 
     # integer type
     rng = np.random.default_rng(42)
-    seed = rng.integers(low=0, high=int(1e7))
+    seed = int(rng.integers(low=0, high=int(1e7)))
     assert not isinstance(seed, int)
     assert isinstance(seed, np.integer)