Update deprecated typing

[casse-boubou]

I update sensor.py and change homeassistant.helpers.typing.EventType to homeassistant.core.Event because it was deprecated in 2025.5 in accordance with what is published here HA core update And resolve this issus https://github.com/custom-components/places/issues/275

My log show : EventType was used from places, this is a deprecated alias which will be removed in HA Core 2025.5. Use homeassistant.core.Event instead, please report it to the author of the 'places' custom integration