Potential fix for code scanning alert no. 2304: Missed opportunity to use Where

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: baywet

src/Microsoft.OpenApi/Models/JsonSchemaReference.cs

@@ -133,14 +133,7 @@ protected override void SetAdditional31MetadataFromMapNode(JsonObject jsonObject
         // Examples
         if (jsonObject.TryGetPropertyValue(OpenApiConstants.Examples, out var examplesNode) && examplesNode is JsonArray examplesArray)
         {
-            Examples = new List<JsonNode>();
-            foreach (var example in examplesArray)
-            {
-                if (example != null)
-                {
-                    Examples.Add(example);
-                }
-            }
+            Examples = examplesArray.Where(example => example != null).ToList();
         }
     }
 }