fix tests. new product advisories enhancements

src/__Libraries/StellaOps.FeatureFlags.Tests/CompositeFeatureFlagServiceTests.cs

@@ -137,7 +137,7 @@ public class CompositeFeatureFlagServiceTests : IDisposable
             UserId: "user-123",
             TenantId: "tenant-456",
             Environment: "production",
-            Attributes: new Dictionary<string, object?> { { "role", "admin" } });
+            Attributes: new Dictionary<string, object> { { "role", "admin" } });
 
         FeatureFlagEvaluationContext? capturedContext = null;
         _primaryProvider

src/__Libraries/StellaOps.FeatureFlags.Tests/FeatureFlagModelsTests.cs

@@ -58,7 +58,7 @@ public class FeatureFlagModelsTests
     public void FeatureFlagEvaluationContext_CanBeCreatedWithAllValues()
     {
         // Arrange
-        var attributes = new Dictionary<string, object?>
+        var attributes = new Dictionary<string, object>
         {
             { "role", "admin" },
             { "subscription", "premium" }