explicit dispose skia objects (#19100)

src/Skia/Avalonia.Skia/Gpu/OpenGl/FboSkiaSurface.cs

@@ -89,10 +89,10 @@ namespace Avalonia.Skia
                 throw new OpenGlException("Unable to create FBO with stencil");
             }
 
-            var target = new GRBackendRenderTarget(pixelSize.Width, pixelSize.Height, 0, 8,
+            using var target = new GRBackendRenderTarget(pixelSize.Width, pixelSize.Height, 0, 8,
                 new GRGlFramebufferInfo((uint)_fbo, SKColorType.Rgba8888.ToGlSizedFormat()));
-            _surface = SKSurface.Create(_grContext, target,
-                surfaceOrigin, SKColorType.Rgba8888, new SKSurfaceProperties(SKPixelGeometry.RgbHorizontal));
+            using var properties = new SKSurfaceProperties(SKPixelGeometry.RgbHorizontal);
+            _surface = SKSurface.Create(_grContext, target, surfaceOrigin, SKColorType.Rgba8888, properties);
             CanBlit = gl.IsBlitFramebufferAvailable;
         }