Fix get_time_zone annotations in dt_util (#129050)

homeassistant/util/dt.py

@@ -95,7 +95,7 @@ def set_default_time_zone(time_zone: dt.tzinfo) -> None:
     get_default_time_zone.cache_clear()
 
 
-def get_time_zone(time_zone_str: str) -> dt.tzinfo | None:
+def get_time_zone(time_zone_str: str) -> zoneinfo.ZoneInfo | None:
     """Get time zone from string. Return None if unable to determine.
 
     Must be run in the executor if the ZoneInfo is not already
@@ -107,7 +107,7 @@ def get_time_zone(time_zone_str: str) -> dt.tzinfo | None:
         return None
 
 
-async def async_get_time_zone(time_zone_str: str) -> dt.tzinfo | None:
+async def async_get_time_zone(time_zone_str: str) -> zoneinfo.ZoneInfo | None:
     """Get time zone from string. Return None if unable to determine.
 
     Async friendly.