Bump Avalonia.Desktop and Avalonia

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 11.1.1 to 11.1.2
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](AvaloniaUI/Avalonia@11.1.1...11.1.2)

Updates `Avalonia` from 11.1.1 to 11.1.2
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](AvaloniaUI/Avalonia@11.1.1...11.1.2)

---
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] <support@github.com>

GTiff2Tiles.Avalonia/GTiff2Tiles.Avalonia.csproj

@@ -7,8 +7,8 @@
 
     <ItemGroup>
         <!-- External dependencies -->
-        <PackageReference Include="Avalonia" Version="11.1.1" />
-        <PackageReference Include="Avalonia.Desktop" Version="11.1.1" />
+        <PackageReference Include="Avalonia" Version="11.1.2" />
+        <PackageReference Include="Avalonia.Desktop" Version="11.1.2" />
         <PackageReference Include="Avalonia.Diagnostics" Version="11.0.10" />
         <PackageReference Include="Avalonia.ReactiveUI" Version="11.0.10" />
         <PackageReference Include="Avalonia.Themes.Fluent" Version="11.0.10" />