Force update group power sensor when member sensor force updates (#3938)

* feat: force update group power sensor

* chore(lint): [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

Author: bramstroker

custom_components/powercalc/sensors/group/custom.py

@@ -426,6 +426,7 @@ class GroupedSensor(BaseEntity, SensorEntity):
     _attr_should_poll = False
     _unrecorded_attributes = frozenset({ATTR_ENTITIES, ATTR_IS_GROUP})
     _is_energy_sensor = False
+    _attr_force_update = True
 
     def __init__(
         self,