TST: Added ut to test that runs locally but not on Github.

conjugate_map/tests/test_conjcalc.py

@@ -41,6 +41,7 @@ def test_geopack_method_north(self):
         """
         Test `findconj` with 'geopack' method for a northern hemisphere point.
         """
+        self.ut = dt.datetime(1980, 11, 3, 18, 0, 0)
         self.expected_lat = 65.38287134065757
         self.expected_lon = 65.63983817802247