feat: 移除Nonce锁

scfs-api-core/src/main/java/com/czcb/scfs/api/core/util/Nonce.java

@@ -7,8 +7,6 @@ import java.util.UUID;
  * @since 2.0.0
  */
 public class Nonce {
-    private static final Object lock = new Object();
-
     private Nonce() {
     }
 
@@ -16,8 +14,6 @@ public class Nonce {
      * @return nonce 随机串
      */
     public static String ofNonce() {
-        synchronized (lock) {
-            return UUID.randomUUID().toString().replace("-", "").toLowerCase();
-        }
+        return UUID.randomUUID().toString().replace("-", "").toLowerCase();
     }
 }