Add humidity to weather forecast (#95064)

* allow humidty in forecast

* Add tests

* float

---------

Co-authored-by: G Johansson <goran.johansson@shiftit.se>

tests/testing_config/custom_components/test/weather.py

@@ -6,6 +6,7 @@ from __future__ import annotations
 
 from homeassistant.components.weather import (
     ATTR_FORECAST_CLOUD_COVERAGE,
+    ATTR_FORECAST_HUMIDITY,
     ATTR_FORECAST_NATIVE_APPARENT_TEMP,
     ATTR_FORECAST_NATIVE_DEW_POINT,
     ATTR_FORECAST_NATIVE_PRECIPITATION,
@@ -223,6 +224,7 @@ class MockWeatherMockForecast(MockWeather):
                 ATTR_FORECAST_NATIVE_PRECIPITATION: self._values.get(
                     "native_precipitation"
                 ),
+                ATTR_FORECAST_HUMIDITY: self.humidity,
             }
         ]