Upgrade WASDK from 1.6 to 1.8

[Avid29]

PR Type

What kind of change does this PR introduce?

• Build or CI related changes

Please check if your PR fulfills the following requirements:

• Created a feature/dev branch in your fork (vs. submitting directly from a commit on main)
• Based off latest main branch of toolkit
• Tested code with current supported SDKs
  (https://github.com/CommunityToolkit/WindowsCommunityToolkit-design-assets)
• Tests for the changes have been added (if applicable)
• Header has been added to all new source files
• Contains NO breaking changes

Other information

This is currently blocked by 2 dependencies, which must be updated to 1.8 before we can update

Blocked by

• Microsoft.Xaml.Behaviors.WinUI.Managed (Currently on version 3.0.0 - using wasdk 1.6.250108002)
• Microsoft.Graphics.Win2D (Currently on version 1.3.2 - using wask 1.6.241114003)

[Avid29]

One dependency has been updated!
microsoft/XamlBehaviors#314

[michael-hawker]

@Sergio0694 the releases on GitHub for the XAML Behaviors I think are still out-of-date, has the update for the package been shipped to NuGet yet, is that something we can do?

Also, any idea on Win2D getting updated?

[Sergio0694]

@michael-hawker I'll check with folks and ping people (and help if needed) as soon as I'm back later this week :)