Improve type hints in camera

[epenet]

Proposed change

Improve type hints in camera
Spotted whilst reviewing #81790

Type of change

• Dependency upgrade
• Bugfix (non-breaking change which fixes an issue)
• New integration (thank you!)
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• Breaking change (fix/feature causing existing functionality to break)
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• This PR fixes or closes issue: fixes #
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[home-assistant]

Hey there @home-assistant/core, mind taking a look at this pull request as it has been labeled with an integration (camera) you are listed as a code owner for? Thanks!

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Code owners of camera can trigger bot actions by commenting:

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[akx]

(So the inferred type for camera_prefsis CameraEntityPreferences. Okiedoke!) 👍

[epenet]

Cc @uvjustin
Might conflict with #81663

[uvjustin]

Cc @uvjustin Might conflict with #81663

That's fine, I'll have to rebase after #81835 anyway.

[uvjustin]

LGTM