Bumped Whispercpp 1.7.3 that adds WithNoSpeechThreshold #278

Job	Run time
linux-cuda	0s
linux-vulkan	0s
macos-coreml	0s
linux-openvino	0s
windows-cuda	0s
windows-openvino	0s
windows-vulkan	0s
android / native-build	1m 57s
linux / native-build	2m 16s
linux-no-avx / native-build	1m 22s
macos / arm-native-build	2m 39s
macos / intel-native-build	58s
wasm / native-build	1m 3s
windows / arm-native-build	1m 4s
windows / intel-native-build	1m 50s
windows-no-avx / native-build	2m 23s
dotnet-build / dotnet-macos	3m 0s
dotnet-build / dotnet-windows	3m 7s
dotnet-build / dotnet-linux	1m 16s
dotnet-maui-build-and-test / dotnet-maui-build	2m 11s
dotnet-maui-build-and-test / dotnet-maui-test-android	0s
dotnet-maui-build-and-test / dotnet-maui-test-ios	0s
	25m 6s

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