Hyrotherm X8: adjust temperature range for tests

tests/devices/test_hydrotherm_dynamicx8.py

@@ -58,10 +58,10 @@ class TestHydrothermDynamicX8(
         self.assertEqual(self.subject.current_temperature, 55)
 
     def test_min_temp(self):
-        self.assertEqual(self.subject.min_temp, 60)
+        self.assertEqual(self.subject.min_temp, 15)
 
     def test_max_temp(self):
-        self.assertEqual(self.subject.max_temp, 70)
+        self.assertEqual(self.subject.max_temp, 75)
 
     def test_target_temperature(self):
         self.dps[TEMPERATURE_DP] = 61