chore(samples/dotnet): bump deps to latest stable

- Microsoft.NET.Test.Sdk 17.14.1 → 18.5.1 (3 test projects)
- Duende.IdentityModel 7.1.0 → 8.1.0 (token-refresh; major bump)
- System.Drawing.Common 8.0.26 → 10.0.7 (saml-sp-login tests, transitive
  override aligned with the .NET 10 baseline)

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ksroda-sa

samples/dotnet/login-auth-code/tests/login-auth-code.tests.csproj

@@ -8,7 +8,7 @@
     <RootNamespace>LoginAuthCode.Tests</RootNamespace>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.7" />

samples/dotnet/saml-sp-login/tests/saml-sp-login.tests.csproj

@@ -8,12 +8,12 @@
     <RootNamespace>SamlSpLogin.Tests</RootNamespace>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.7" />
     <!-- Override transitive dep with vulnerable System.Drawing.Common 4.7.0 (NU1904 / GHSA-rxg9-xrhp-64gj). -->
-    <PackageReference Include="System.Drawing.Common" Version="8.0.26" />
+    <PackageReference Include="System.Drawing.Common" Version="10.0.7" />
   </ItemGroup>
   <ItemGroup>
     <ProjectReference Include="..\src\saml-sp-login.csproj" />

samples/dotnet/token-refresh/src/token-refresh.csproj

@@ -9,6 +9,6 @@
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.Authentication.OpenIdConnect" Version="10.0.7" />
     <PackageReference Include="DotNetEnv" Version="3.2.0" />
-    <PackageReference Include="Duende.IdentityModel" Version="7.1.0" />
+    <PackageReference Include="Duende.IdentityModel" Version="8.1.0" />
   </ItemGroup>
 </Project>

samples/dotnet/token-refresh/tests/token-refresh.tests.csproj

@@ -8,7 +8,7 @@
     <RootNamespace>TokenRefresh.Tests</RootNamespace>
   </PropertyGroup>
   <ItemGroup>
-    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="17.14.1" />
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="18.5.1" />
     <PackageReference Include="xunit" Version="2.9.3" />
     <PackageReference Include="xunit.runner.visualstudio" Version="3.1.5" />
     <PackageReference Include="Microsoft.AspNetCore.Mvc.Testing" Version="10.0.7" />

snippets.json

@@ -691,7 +691,7 @@
       ],
       "framework": "ios",
       "lib": "AppAuth-iOS",
-      "lib_version": "2.0.0",
+      "lib_version": "1.7.6",
       "docs_url": "https://github.com/openid/AppAuth-iOS",
       "install": "",
       "repo_path": "samples/ios/login-pkce",