[BUG] Set device_class for temperature sensors

Environment

ShellyForHASS release with the issue: 0.3.5
Last working ShellyForHASS release (if known): /
Home Assistant Core release with the issue: 2022.5.5
Operating environment (Home Assistant/Supervised/Docker/venv): HA OS

Describe the bug

According to https://github.com/home-assistant/core/pull/69069 which was shipped with HA 2022.5 (see "Temperature Conversion" in the Breaking Changes section @ https://www.home-assistant.io/blog/2022/05/04/release-20225/#breaking-changes)

Sensors reporting a temperature but not setting device class to temperature will no longer have their values automatically converted.

Currently e. g. all Shelly Plug S providing a "* - Device temperature" sensor seem to be affected by this:

state_class: null
shelly_type: Shelly Plug S
shelly_id: XXXXXX
ip_address: xxx.xxx.xxx.xxx
unit_of_measurement: °C
icon: mdi:oil-temperature
friendly_name: Name - Device temperature

So the needed device_class: temperature is simply missing.

Steps to Reproduce

Expected behavior

Integration temperature sensors are compliant to HA 2022.5 and later.

Screenshots

Traceback/Error logs

Additional context

There seem to be no other negative effects (besides the missing ability to configure the unit of measurement in the UI) and everyone could easily work around this by setting the deviceclass using customize.yaml. But I think the integration should take care of this. ==> Update: setting it using customize.yaml did not change the UI. Maybe the integration has to do this._

From another integration (compliant): grafik

ShellyforHASS integration (missing unit of measurement section ==> Update: same with set parameter using customize.yaml): grafik

StyraHem / ShellyForHASS