Fix race condition in Matter unsubscribe method

[marcelveldt]

Proposed change

Fix a small race condition where we cant unsubscribe from receiving matter event updates while the integration is reloaded, e.g. after renaming/disabling entities.

I'm still not sure why we can hit into this race condition but at least this patches it for now to take pressure away.
Long term fix we could give the subscription an id in the client library.

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 Renaming Matter entities can cause ALL Matter devices go to offline #103266 fixes Custom name for device with Matter integration #103541
• This PR is related to issue:
• Link to documentation pull request:

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