Update dependency Avalonia.Desktop to v0.10.20

This MR contains the following updates:

Package	Type	Update	Change
Avalonia.Desktop (source)	nuget	patch	0.10.19 -> 0.10.20

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Release Notes

AvaloniaUI/Avalonia

v0.10.20

Compare Source

• Critical MacOS fix, after 24 hours mouse events behave strangely.
• Crash could occur if tooltip open / close collided with window resizing.
• Fix popup pointer positioning from touch.
• When ExtendClientAreaToDecorations is true, and CanResize = false, dont allow Zoom osx or Maximize on Windows.

other small bug fixes

https://www.nuget.org/packages/Avalonia/0.10.20

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