Update quarkus-asyncapi/runtime/src/main/java/io/quarkiverse/asyncapi…

…/config/AsyncAPISupplierFactory.java

Co-authored-by: Helber Belmiro <helber.belmiro@gmail.com>

quarkus-asyncapi/runtime/src/main/java/io/quarkiverse/asyncapi/config/AsyncAPISupplierFactory.java

@@ -26,7 +26,7 @@ public class AsyncAPISupplierFactory {
     private static AsyncAPISupplierFactory instance;
 
     private final Set<String> EXTENSIONS = Set.of(".yml", ".yaml", ".json");
-    private Collection<AsyncAPISupplier> asyncAPISuppliers = new ArrayList<>();
+    private final Collection<AsyncAPISupplier> asyncAPISuppliers = new ArrayList<>();
 
     public static AsyncAPISupplierFactory init(ConfigSourceContext context) {
         instance = new AsyncAPISupplierFactory(context);