Replace async_track_state_change with async_track_state_change_event

[mikeage]

Throws warnings in 2024.5+

See https://developers.home-assistant.io/blog/2024/04/13/deprecate_async_track_state_change/

Note that the component still doesn't work properly under 2024.5; see #326 .

Description

Checklist

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• Issue raised to compliment this PR (if no pre-existing issue exists)
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License

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Related Issues

Closes

[robchandhok]

This patch works for me.

[elupus]

Looks good to me. The threading fixes in that other issue are needed to get it up and running again.