Fix: Registry update fails when Device Model property is an array

[FrankBakkerNl]

Breaking change

Proposed change

Type of change

• [ ] Dependency upgrade
• [ ] Bugfix (non-breaking change which fixes an issue)
• [ ] New feature (which adds functionality to an existing integration)
• [ ] 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 #
• This PR is related to issue:
• Link to documentation pull request:

Checklist

• [ ] The code change is tested and works locally.
• [ ] Local tests pass. Your PR cannot be merged unless tests pass
• [ ] The code compiles without warnings (code quality check)
• [ ] Tests have been added to verify that the new code works.

If user exposed functionality or configuration are added/changed:

• [ ] Documentation added/updated for http://netdaemon.xtz

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 85.71429% with 1 line in your changes missing coverage. Please review.

Project coverage is 82%. Comparing base (3713081) to head (ac9608e). Report is 1 commits behind head on main.

Files	Patch %	Lines
....HassClient/Internal/Json/EnsureStringConverter.cs	85%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #1160 +/- ## ==================================== Coverage 82% 82% ==================================== Files 190 189 -1 Lines 3782 3777 -5 Branches 423 421 -2 ==================================== + Hits 3116 3121 +5 + Misses 499 491 -8 + Partials 167 165 -2 ``` | [Flag](https://app.codecov.io/gh/net-daemon/netdaemon/pull/1160/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=net-daemon) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/net-daemon/netdaemon/pull/1160/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=net-daemon) | `82% <85%> (+<1%)` | :arrow_up: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=net-daemon#carryforward-flags-in-the-pull-request-comment) to find out more.

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