build(deps): update ReactiveUI requirement from 16.* to 17.* in /samples

Updates the requirements on [ReactiveUI](https://github.com/reactiveui/reactiveui) to permit the latest version.
- [Release notes](https://github.com/reactiveui/reactiveui/releases)
- [Commits](reactiveui/ReactiveUI@16.1.1...17.0.1)

---
updated-dependencies:
- dependency-name: ReactiveUI
  dependency-type: direct:production
...

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

samples/LoginApp.Android/LoginApp.Android.csproj

@@ -71,7 +71,7 @@
     <AndroidResource Include="Resources\values\styles.xml" />
   </ItemGroup>
   <ItemGroup>
-    <PackageReference Include="ReactiveUI" Version="16.*" />
+    <PackageReference Include="ReactiveUI" Version="17.*" />
     <PackageReference Include="ReactiveUI.AndroidX" Version="16.*" />
     <PackageReference Include="ReactiveUI.Validation" Version="2.*" />
     <PackageReference Include="ReactiveUI.Validation.AndroidX" Version="2.*" />

samples/LoginApp.Uwp/LoginApp.Uwp.csproj

@@ -148,7 +148,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.NETCore.UniversalWindowsPlatform" Version="6.2.13" />
-    <PackageReference Include="ReactiveUI" Version="16.*" />
+    <PackageReference Include="ReactiveUI" Version="17.*" />
     <PackageReference Include="ReactiveUI.Validation" Version="2.*" />
   </ItemGroup>
   <ItemGroup>

samples/LoginApp/LoginApp.csproj

@@ -3,7 +3,7 @@
     <TargetFramework>netstandard2.0</TargetFramework>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="ReactiveUI" Version="16.*" />
+    <PackageReference Include="ReactiveUI" Version="17.*" />
     <PackageReference Include="ReactiveUI.Fody" Version="16.*" />
     <PackageReference Include="ReactiveUI.Validation" Version="2.*" />
   </ItemGroup>