Fix De Lijn component tzinfo error

This fix should update the issue "Error:'str' object has no attribute 'tzinfo'" (issue #67455)

homeassistant/components/delijn/sensor.py

@@ -3,6 +3,8 @@
 
 import logging
 
+from datetime import datetime
+
 from pydelijn.api import Passages
 from pydelijn.common import HttpException
 import voluptuous as vol
@@ -111,7 +113,7 @@ async def async_update(self):
             first = self.line.passages[0]
             if (first_passage := first["due_at_realtime"]) is None:
                 first_passage = first["due_at_schedule"]
-            self._attr_native_value = first_passage
+            self._attr_native_value = datetime.strptime(first_passage, '%Y-%m-%dT%H:%M:%S%z')
 
             for key in AUTO_ATTRIBUTES:
                 self._attr_extra_state_attributes[key] = first[key]