Fix test due to using closer temp_air in rho_hub()

Author: SabineHaas

tests/test_modelchain.py

@@ -102,10 +102,10 @@ def test_rho_hub(self):
                        'pressure': 0}
 
         # temp_air_2 is closer to hub height than temp_air  # TODO: Add test for temp_air is closer to hub height than temp_air_2
-        rho_exp = pd.Series(data=[1.30617, 1.29966])
+        rho_exp = pd.Series(data=[1.30591, 1.30919])
         assert_series_equal(test_mc.rho_hub(weather, data_height), rho_exp)
         assert_series_equal(test_mc.rho_hub(weather_df, data_height), rho_exp)
-        rho_exp = np.array([1.30616958, 1.29965556])
+        rho_exp = np.array([1.30591464, 1.30919432])
         assert_allclose(test_mc.rho_hub(weather_arr, data_height), rho_exp)
         rho_exp = pd.Series(data=[1.30309, 1.42707])
         assert_series_equal(test_mc_2.rho_hub(weather, data_height), rho_exp)