Fix code style: replace double-brace initialization with explicit map creation

Addressed code review feedback to avoid anonymous inner class memory leak by using explicit HashMap creation instead of double-brace initialization

Co-authored-by: saragluna <[email protected]>

Author: Copilot

sdk/spring/spring-cloud-azure-stream-binder-servicebus/src/test/java/com/azure/spring/cloud/stream/binder/servicebus/implementation/ServiceBusRetryTest.java

@@ -23,6 +23,7 @@
 
 import java.time.Duration;
 import java.util.HashMap;
+import java.util.Map;
 
 import static org.assertj.core.api.Assertions.assertThat;
 import static org.mockito.Mockito.when;
@@ -122,11 +123,9 @@ private void prepareConsumerProperties() {
         ServiceBusBindingProperties bindingProperties = new ServiceBusBindingProperties();
         bindingProperties.setConsumer(serviceBusConsumerProperties);
 
-        extendedBindingProperties.setBindings(new HashMap<String, ServiceBusBindingProperties>() {
-            {
-                put(ENTITY_NAME, bindingProperties);
-            }
-        });
+        Map<String, ServiceBusBindingProperties> bindings = new HashMap<>();
+        bindings.put(ENTITY_NAME, bindingProperties);
+        extendedBindingProperties.setBindings(bindings);
         binder.setBindingProperties(extendedBindingProperties);
 
         consumerProperties = new ExtendedConsumerProperties<>(serviceBusConsumerProperties);