Add unique_id to Uptime Robot config_flow

[ludeeus]

Breaking change

Add unique_id to the Config Flow

To better handle API key issues pyuptimerobot was bumped to 21.8.2
https://github.com/ludeeus/pyuptimerobot/releases/tag/21.8.2

Proposed change

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• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
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[MartinHjelmare]

Looks good!

Thanks for the approval, but I'ts still missing the library bump and adjustments for api_key issues