update SkiaSharp to 2.88.8

Author: janusw

Source/OxyPlot.Maui.Skia/OxyPlot.Maui.Skia.csproj

@@ -34,8 +34,8 @@
 </PropertyGroup>
 <ItemGroup>
 <PackageReference Include="OxyPlot.Core" Version="2.1.2" />
-<PackageReference Include="SkiaSharp.HarfBuzz" Version="2.88.6" />
-<PackageReference Include="SkiaSharp.Views.Maui.Controls" Version="2.88.6" />
+<PackageReference Include="SkiaSharp.HarfBuzz" Version="2.88.8" />
+<PackageReference Include="SkiaSharp.Views.Maui.Controls" Version="2.88.8" />
 </ItemGroup>
 
 <ItemGroup Condition=" $(TargetFramework.StartsWith('net8.0')) ">