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fix: return a valid NtpTime from SyncClock::GetNtpTime (#193) #201

Job	Run time
build-windows (windows_x86_64, windows-2022, 17)	10m 26s
build-linux (linux_arm64, ubuntu-22.04, 17)	5m 26s
build-linux (linux_arm, ubuntu-22.04, 17)	4m 9s
build-linux (linux_x86-64, ubuntu-22.04, 17)	8m 21s
build-macos (macos_arm64, macos-14, 17)	4m 10s
build-macos (macos_x86-64, macos-14, 17)	14m 59s
	47m 31s

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