Update stable version in repo from 4.2.1 to 4.3.0

[GermanBluefox]

Think about update stable version to 4.3.0

Version: stable=4.2.1 (198 days old) => latest=4.3.0 (30 days old) Installs: stable=150 (33.71%), latest=22 (4.94%), total=445

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Note: This is an automatically generated message and not personally authored by bluefox!

[mcm1957]

@klein0r Is there any reason to delay updating stable any longer? Please drop a commit if you know any reason to refrain from updating.

If there is no response within the next 30 days, we could decide to update anyway.

[klein0r]

https://github.com/ioBroker/ioBroker.repositories/pull/2716