Fix assertion error when unloading ZHA with pollable entities

[dmulcahey]

Proposed change

This PR corrects an issue with unloading ZHA when certain pollable entities are present. This fixes the linked issue below and the issue mentioned in this comment #105506 (comment)

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 ZHA not updating sensors with new data from cluster attributes following a reload of the integration #107260
• This PR is related to issue:
• Link to documentation pull request:

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[home-assistant]

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

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