[Dubbo-5688] Fix timeout error when publish config to nacos (#5689)

* Fix timeout bug when publish config to nacos

* Add test case for publishConfig info

Author: laddcn

dubbo-configcenter/dubbo-configcenter-nacos/src/main/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfiguration.java

@@ -260,7 +260,7 @@ public boolean publishConfig(String key, String group, String content) {
         boolean published = false;
         String resolvedGroup = resolveGroup(group);
         try {
-            String value = configService.getConfig(key, resolvedGroup, -1L);
+            String value = configService.getConfig(key, resolvedGroup, DEFAULT_TIMEOUT);
             if (StringUtils.isNotEmpty(value)) {
                 content = value + "," + content;
             }

dubbo-configcenter/dubbo-configcenter-nacos/src/test/java/org/apache/dubbo/configcenter/support/nacos/NacosDynamicConfigurationTest.java

@@ -36,6 +36,9 @@
 import java.util.SortedSet;
 import java.util.concurrent.CountDownLatch;
 
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
 
 /**
  * Unit test for nacos config center support
@@ -140,6 +143,16 @@ public static void setUp() {
         }
     }
 
+    @Test
+    public void testPublishConfig() {
+        String key = "user-service";
+        String group = "org.apache.dubbo.service.UserService";
+        String content = "test";
+
+        assertTrue(config.publishConfig(key, group, content));
+        assertEquals("test", config.getProperties(key, group));
+    }
+
     @AfterAll
     public static void tearDown() {