Update ci.yml

Correct typo in validation script

.github/workflows/ci.yml

@@ -61,8 +61,8 @@ jobs:
               !obj.link || 
               !obj.language || 
               !obj.pubDate || 
-              !Array.isArray(obj.items) || 
-              obj.items.length === 0) {
+              !Array.isArray(obj.item) || 
+              obj.item.length === 0) {
             console.error('Invalid object');
             process.exit(1);
           }