Migrate attribution attribute for Picnic (#57507)

homeassistant/components/picnic/sensor.py

@@ -5,7 +5,6 @@ from typing import Any
 
 from homeassistant.components.sensor import SensorEntity
 from homeassistant.config_entries import ConfigEntry
-from homeassistant.const import ATTR_ATTRIBUTION
 from homeassistant.core import HomeAssistant
 from homeassistant.helpers.typing import StateType
 from homeassistant.helpers.update_coordinator import (
@@ -41,8 +40,8 @@ async def async_setup_entry(
 class PicnicSensor(SensorEntity, CoordinatorEntity):
     """The CoordinatorEntity subclass representing Picnic sensors."""
 
+    _attr_attribution = ATTRIBUTION
     entity_description: PicnicSensorEntityDescription
-    _attr_extra_state_attributes = {ATTR_ATTRIBUTION: ATTRIBUTION}
 
     def __init__(
         self,

tests/components/picnic/test_sensor.py

@@ -138,6 +138,8 @@ class TestPicnicSensor(unittest.IsolatedAsyncioTestCase):
         if unit:
             assert sensor.attributes["unit_of_measurement"] == unit
 
+        assert sensor.attributes["attribution"] == "Data provided by Picnic"
+
     async def _setup_platform(
         self, use_default_responses=False, enable_all_sensors=True
     ):