PIR only supports old temperature api

The PIR currently only uses the old api for getting temperatures.
The new one is under `/api/v1/temperature`

https://github.com/home-assistant-ecosystem/python-mystrom/blob/b8f79c6e2bcd2197d30c2d7c7e9f5840b45d704d/pymystrom/pir.py#L66C49-L66C49