build(deps): bump MessageBox.Avalonia from 1.1.2 to 1.2.0 in /samples (#258)

Bumps [MessageBox.Avalonia](https://github.com/CreateLab/MessageBox.Avalonia) from 1.1.2 to 1.2.0.
- [Release notes](https://github.com/CreateLab/MessageBox.Avalonia/releases)
- [Commits](https://github.com/CreateLab/MessageBox.Avalonia/commits)

Signed-off-by: dependabot[bot] <[email protected]>

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

samples/LoginApp.Avalonia/LoginApp.Avalonia.csproj

@@ -9,7 +9,7 @@
         <PackageReference Include="Avalonia.Desktop" Version="0.10.2" />
         <PackageReference Include="Avalonia.ReactiveUI" Version="0.10.2" />
         <PackageReference Include="Citrus.Avalonia" Version="1.4.3" />
-        <PackageReference Include="MessageBox.Avalonia" Version="1.1.2" />
+        <PackageReference Include="MessageBox.Avalonia" Version="1.2.0" />
         <PackageReference Include="XamlNameReferenceGenerator" Version="1.1.2" />
     </ItemGroup>