Remove type variable no longer needed

Signed-off-by: Daniel Zullo <[email protected]>

Author: daniel-zullo-frequenz

src/frequenz/sdk/actor/power_distributing/_battery_status.py

@@ -10,7 +10,7 @@
 from dataclasses import dataclass
 from datetime import datetime, timedelta, timezone
 from enum import Enum
-from typing import Iterable, Optional, Set, TypeVar, Union
+from typing import Iterable, Optional, Set, Union
 
 # pylint: disable=no-name-in-module
 from frequenz.api.microgrid.battery_pb2 import ComponentState as BatteryComponentState
@@ -60,9 +60,6 @@ class SetPowerResult:
     """Set of the batteries that failed."""
 
 
-T = TypeVar("T")
-
-
 @dataclass
 class _ComponentStreamStatus:
     component_id: int