Update skiasharp monorepo to 2.88.9

This MR contains the following updates:

Package	Type	Update	Change
SkiaSharp (source)	nuget	patch	2.88.8 -> 2.88.9
SkiaSharp.NativeAssets.Linux (source)	nuget	patch	2.88.8 -> 2.88.9
SkiaSharp.NativeAssets.Win32 (source)	nuget	patch	2.88.8 -> 2.88.9
SkiaSharp.NativeAssets.macOS (source)	nuget	patch	2.88.8 -> 2.88.9

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Release Notes

mono/SkiaSharp (SkiaSharp)

v2.88.9: Version 2.88.9

What's Changed

• Add symbols to the packages by @​mattleibow in https://github.com/mono/SkiaSharp/pull/3046
• Use a snapshot now that 4.0 has been removed by @​mattleibow in https://github.com/mono/SkiaSharp/pull/3054

Full Changelog: https://github.com/mono/SkiaSharp/compare/v2.88.9-preview.2.2...v2.88.9

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