Fix .net Mapping.xml

Author: hzqst

Graphics/GraphicsEngine.NET/Mapping.xml

@@ -174,7 +174,7 @@
 		<map field="PipelineStateCreateInfo::NumSpecializationConstants" relation="length(pSpecializationConstants)"/>
 		<map field="PipelineStateCreateInfo::pInternalData" visibility="private"/>
 
-		<map field="SpecializationConstant::pData" type="void" keep-pointers="true"/>
+		<map field="SpecializationConstant::pData" type="System.IntPtr"/>
 
 		<map field="RayTracingPipelineStateCreateInfo::GeneralShaderCount" relation="length(pGeneralShaders)"/>
 		<map field="RayTracingPipelineStateCreateInfo::TriangleHitShaderCount" relation="length(pTriangleHitShaders"/>