Bump Avalonia.Desktop and Avalonia in /src (#87)

Bumps [Avalonia.Desktop](https://github.com/AvaloniaUI/Avalonia) and [Avalonia](https://github.com/AvaloniaUI/Avalonia). These dependencies needed to be updated together.

Updates `Avalonia.Desktop` from 11.0.5 to 11.0.6
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](AvaloniaUI/Avalonia@11.0.5...11.0.6)

Updates `Avalonia` from 11.0.5 to 11.0.6
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](AvaloniaUI/Avalonia@11.0.5...11.0.6)

---
updated-dependencies:
- dependency-name: Avalonia.Desktop
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: Avalonia
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Simon Cropp <[email protected]>

src/TestableApp/TestableApp.csproj

@@ -9,7 +9,7 @@
 
   <ItemGroup>
     <PackageReference Include="Avalonia" Version="11.0.6" />
-    <PackageReference Include="Avalonia.Desktop" Version="11.0.5" />
+    <PackageReference Include="Avalonia.Desktop" Version="11.0.6" />
     <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.6" />
     <PackageReference Include="Avalonia.Fonts.Inter" Version="11.0.5" />
     <PackageReference Condition="'$(Configuration)' == 'Debug'" Include="Avalonia.Diagnostics" Version="11.0.6" />