Update test to expect 2 cache keys instead of 1

Modified the assertion in `CacheDependencyBuilderTests.cs` to expect
`result.CacheKeys.Length` to be 2. This change reflects an update
in the `Create` method of the `builder` object, which now generates
or requires two cache keys.

tests/XperienceCommunity.DataRepository.Tests/Builder/CacheDependencyBuilderTests.cs

@@ -74,7 +74,7 @@ public void Create_ShouldHandleMultipleDependencyKeys()
             // Assert
             Assert.That(result, Is.Not.Null);
             Assert.That(result, Is.InstanceOf<CMSCacheDependency>());
-            Assert.That(1, Is.EqualTo(result.CacheKeys.Length));
+            Assert.That(2, Is.EqualTo(result.CacheKeys.Length));
         }
 
         public class MockContentItemFieldsSource : IContentItemFieldsSource