build(deps): bump Avalonia.ReactiveUI from 0.10.2 to 0.10.3 in /samples (#260)

Bumps [Avalonia.ReactiveUI](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] <[email protected]>

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

Author: dependabot[bot]

samples/LoginApp.Avalonia/LoginApp.Avalonia.csproj

@@ -7,7 +7,7 @@
     <ItemGroup>
         <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="Avalonia.ReactiveUI" Version="0.10.3" />
         <PackageReference Include="Citrus.Avalonia" Version="1.4.3" />
         <PackageReference Include="MessageBox.Avalonia" Version="1.2.0" />
         <PackageReference Include="XamlNameReferenceGenerator" Version="1.2.1" />