Deprecated methods will cease working in HA 2022.10

[mattsaxon]

Errors from log

2022-10-05 20:54:57.670 WARNING (MainThread) [homeassistant.components.number] custom_components.speakercraft_media.number::SpeakercraftTreble is overriding deprecated methods on an instance of NumberEntity, this is not valid and will be unsupported from Home Assistant 2022.10. Please report it to the custom integration author.
2022-10-05 20:54:57.687 WARNING (MainThread) [homeassistant.components.number] custom_components.speakercraft_media.number::SpeakercraftBass is overriding deprecated methods on an instance of NumberEntity, this is not valid and will be unsupported from Home Assistant 2022.10. Please report it to the custom integration author.

https://developers.home-assistant.io/blog/2022/06/14/number_entity_refactoring/

See similar fix made here https://github.com/AlexxIT/SonoffLAN/pull/903/files

[mattsaxon]

Fixed in #49