Upgrade Silero-Vad model to latest V5 version (#884)
Silero-vad V5 release: https://github.com/snakers4/silero-vad/releases/tag/v5.0
- window_size_samples parameter is fixed at 512.
- Change to use the state variable instead of the existing h and c variables.
- Slightly changed internal logic, now some context (part of previous chunk) is passed along with the current chunk.
- Change the dimensions of the state variable from 64 to 128.
- Replace ONNX file with V5 version