update skiasharp

Author: charlesroddie

CSharpMath.SkiaSharp/CSharpMath.SkiaSharp.csproj

@@ -7,7 +7,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="SkiaSharp" Version="2.80.1" />
+    <PackageReference Include="SkiaSharp" Version="2.88.9" />
     <ProjectReference Include="..\CSharpMath.Rendering\CSharpMath.Rendering.csproj" />
   </ItemGroup>