vad : Silero VAD v6.2.0 (#3524)

* Add ggml-silero-v6.2.0 to download candidates

* Make default VAD model ggml-silero-v6.2.0

* Make VAD model in documentations ggml-silero-v6.2.0

models/download-vad-model.cmd

@@ -25,7 +25,7 @@ rem Count number of arguments passed to script
 set argc=0
 for %%x in (%*) do set /A argc+=1
 
-set models=silero-v5.1.2
+set models=silero-v5.1.2 silero-v6.2.0
 
 rem If argc is not equal to 1 or 2, print usage information and exit
 if %argc% NEQ 1 (

models/download-vad-model.sh

@@ -30,7 +30,7 @@ esac
 models_path="${2:-$default_download_path}"
 
 # Whisper VAD models
-models="silero-v5.1.2"
+models="silero-v5.1.2 silero-v6.2.0"
 
 # list available models
 list_models() {