[camera_avfoundation] Fixes sendability mismatch in completion handler

[jmagman]

This wasn't showing up in CI due to flutter/flutter#194517.

Fixes flutter/flutter#194599

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[gemini-code-assist]

Code Review

This pull request updates the CaptureDevice protocol and its mock implementation in camera_avfoundation to include the @Sendable attribute on the completion handler of setExposureTargetBias. Additionally, the package version is bumped to 0.11.0+4 in pubspec.yaml and the CHANGELOG.md is updated. There are no review comments, and I have no feedback to provide.