fix numpy deprecation errors

Author: evertlammerts

tests/fast/test_all_types.py

@@ -377,9 +377,9 @@ def test_fetchnumpy(self, cur_type):
             ),
             "interval": np.ma.array(
                 [
-                    np.timedelta64(0),
-                    np.timedelta64(2675722599999999000),
-                    np.timedelta64(42),
+                    np.timedelta64(0, "ns"),
+                    np.timedelta64(2675722599999999000, "ns"),
+                    np.timedelta64(42, "ns"),
                 ],
                 mask=[0, 0, 1],
             ),