build(deps): bump Avalonia from 0.10.2 to 0.10.3 in /samples

Bumps [Avalonia](https://github.com/AvaloniaUI/Avalonia) from 0.10.2 to 0.10.3.
- [Release notes](https://github.com/AvaloniaUI/Avalonia/releases)
- [Commits](AvaloniaUI/Avalonia@0.10.2...0.10.3)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

samples/LoginApp.Avalonia/LoginApp.Avalonia.csproj

@@ -5,7 +5,7 @@
     </PropertyGroup>
 
     <ItemGroup>
-        <PackageReference Include="Avalonia" Version="0.10.2" />
+        <PackageReference Include="Avalonia" Version="0.10.3" />
         <PackageReference Include="Avalonia.Desktop" Version="0.10.2" />
         <PackageReference Include="Avalonia.ReactiveUI" Version="0.10.2" />
         <PackageReference Include="Citrus.Avalonia" Version="1.4.3" />