【fix sonar】RedissonManager文件

jero-boot/jero-boot-starter/jero-boot-starter-lock/src/main/java/com/jero/boot/starter/lock/core/RedissonManager.java

@@ -56,14 +56,12 @@ public class RedissonManager {
         private RedissonConfigFactory() {
         }
 
-        private static volatile RedissonConfigFactory factory = null;
+        private static RedissonConfigFactory factory = null;
 
         public static RedissonConfigFactory getInstance() {
-            if (factory == null) {
-                synchronized (Object.class) {
-                    if (factory == null) {
-                        factory = new RedissonConfigFactory();
-                    }
+            synchronized (Object.class) {
+                if (factory == null) {
+                    factory = new RedissonConfigFactory();
                 }
             }
             return factory;