Make EntityRegistryDisabledHandler._handle_entry_updated a callback

[bdraco]

Proposed change

Nothing was being awaited here anymore and this generated 1000s of tasks when disabling a config entry with a lot of entities

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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Checklist

• The code change is tested and works locally.
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[jpbede]

LGTM 👍

[bdraco]

thanks