Update cpal with new screencapturekit

[thewh1teagle]

Describe the feature

Once it's merged

• Support ScreenCapture loopback RustAudio/cpal#894

[jason-ni]

Hi @thewh1teagle I'm looking for a tool can capture specific app like zoom, and do transcribe. I'm not sure
is it a planned feature for vibe. Are you plan to provide this feature when cpal with screencapturekit merged? I'm getting confused whether screencapturekit is using different set of APIs with this swift project: https://github.com/insidegui/AudioCap.