Suez_water: use meter id as unique_id

[jb101010-2]

Proposed change

Change unique_id for suez_water use meter id instead of username which can be changed.
This change is made in prevision of reauth flow which will allow the user to change it's username.

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
• New feature (which adds functionality to an existing integration)
• Deprecation (breaking change to happen in the future)
• Breaking change (fix/feature causing existing functionality to break)
• Code quality improvements to existing code or addition of tests

Additional information

• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @ooii, mind taking a look at this pull request as it has been labeled with an integration (suez_water) you are listed as a code owner for? Thanks!

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[home-assistant]

Please take a look at the requested changes, and use the Ready for review button when you are done, thanks 👍

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[gjohansson-ST]

Few remaining things

[jb101010-2]

all done

[gjohansson-ST]

Thanks @jb101010-2 👍