Update version to 2025.16.0 in Slangc.NET.csproj

Bump the version number in the project file from 2025.15.1 to 2025.16.0 to reflect the latest release.

Author: qian-o

Slangc.NET/Slangc.NET.csproj

@@ -12,7 +12,7 @@
 
     <PropertyGroup Condition="'$(Configuration)' == 'Release'">
         <Title>$(AssemblyName)</Title>
-        <Version>2025.15.1</Version>
+        <Version>2025.16.0</Version>
         <Authors>qian-o</Authors>
         <Copyright>MIT</Copyright>
         <PackageTags>slang;shader;dxc;shaderc</PackageTags>