fix: add guards for MagickImage.AdaptiveThreshold

[Gounlaf]

👋

• ImageMagick requires size_t for with & height, but allow 0.
• no checks done on https://github.com/dlemstra/Magick.Native/blob/a01f5e641d52b1bbf2bf6f5795aba4b4c054a22d/src/Magick.Native/MagickImage.c#L700-L711
• no checks done on binding, only casting

  Magick.NET/src/Magick.NET/Native/MagickImage.cs

  Lines 3933 to 3958 in dd30d8b

  	public void AdaptiveThreshold(int width, int height, double bias, Channels channels)
  	{
  	IntPtr exception = IntPtr.Zero;
  	IntPtr result;
  	#if PLATFORM_AnyCPU
  	if (Runtime.IsArm64)
  	#endif
  	#if PLATFORM_arm64 || PLATFORM_AnyCPU
  	result = NativeMethods.ARM64.MagickImage_AdaptiveThreshold(Instance, (UIntPtr)width, (UIntPtr)height, bias, (NativeChannelsType)channels, out exception);
  	#endif
  	#if PLATFORM_AnyCPU
  	else if (Runtime.Is64Bit)
  	#endif
  	#if PLATFORM_x64 || PLATFORM_AnyCPU
  	result = NativeMethods.X64.MagickImage_AdaptiveThreshold(Instance, (UIntPtr)width, (UIntPtr)height, bias, (NativeChannelsType)channels, out exception);
  	#endif
  	#if PLATFORM_AnyCPU
  	else
  	#endif
  	#if PLATFORM_x86 || PLATFORM_AnyCPU
  	result = NativeMethods.X86.MagickImage_AdaptiveThreshold(Instance, (UIntPtr)width, (UIntPtr)height, bias, (NativeChannelsType)channels, out exception);
  	#endif
  	CheckException(exception, result);
  	if (result != IntPtr.Zero)
  	Instance = result;
  	}

Regards.

[dlemstra]

Thanks for your help.