fix: add guards for MagickImage.SetBitDepth

[Gounlaf]

👋

• https://github.com/ImageMagick/ImageMagick/blob/0deac72ed480ac2ec8e9d766c15ddb3bca055952/MagickCore/attribute.h#L38 requires size_t for depth
• https://github.com/dlemstra/Magick.Native/blob/8861d8354cad042aa39e0daed47f70327cba03f5/src/Magick.Native/MagickImage.c#L2203-L2210 requires size_t for value
• no checks done on binding, except casting to UInt (so >= 0)

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

  Lines 7550 to 7572 in e49ebfe

  	public void SetBitDepth(int value, Channels channels)
  	{
  	IntPtr exception = IntPtr.Zero;
  	#if PLATFORM_AnyCPU
  	if (Runtime.IsArm64)
  	#endif
  	#if PLATFORM_arm64 || PLATFORM_AnyCPU
  	NativeMethods.ARM64.MagickImage_SetBitDepth(Instance, (UIntPtr)value, (NativeChannelsType)channels, out exception);
  	#endif
  	#if PLATFORM_AnyCPU
  	else if (Runtime.Is64Bit)
  	#endif
  	#if PLATFORM_x64 || PLATFORM_AnyCPU
  	NativeMethods.X64.MagickImage_SetBitDepth(Instance, (UIntPtr)value, (NativeChannelsType)channels, out exception);
  	#endif
  	#if PLATFORM_AnyCPU
  	else
  	#endif
  	#if PLATFORM_x86 || PLATFORM_AnyCPU
  	NativeMethods.X86.MagickImage_SetBitDepth(Instance, (UIntPtr)value, (NativeChannelsType)channels, out exception);
  	#endif
  	CheckException(exception);
  	}

Regards 🙂