Deprecate http.api_password (#21884)

* Deprecated http.api_password

* Deprecated ApiConfig.api_password

GitHub Drafted PR would trigger CI after changed it to normal PR.
I have to commit a comment change to trigger it

* Trigger CI

* Adjust if- elif chain in auth middleware

homeassistant/components/hassio/auth.py

@@ -57,9 +57,9 @@ class HassIOAuth(HomeAssistantView):
 
     def _get_provider(self):
         """Return Homeassistant auth provider."""
-        for prv in self.hass.auth.auth_providers:
-            if prv.type == 'homeassistant':
-                return prv
+        prv = self.hass.auth.get_auth_provider('homeassistant', None)
+        if prv is not None:
+            return prv
 
         _LOGGER.error("Can't find Home Assistant auth.")
         raise HTTPNotFound()