change version to v3.8.4

[minggo]

No description provided.

[github-actions]

Interface Check Report

! WARNING this pull request has changed these public interfaces:

@@ -19740,9 +19740,9 @@
         export class frustum extends Frustum {
             constructor();
         }
     }
-    export const VERSION = "3.8.5";
+    export const VERSION = "3.8.4";
     /**
      * @en
      * The main namespace of Cocos engine, all engine core classes, functions, properties and constants are defined in this namespace.
      * @zh
@@ -70195,9 +70195,9 @@
              */
             protected originalTarget: unknown;
             protected target: unknown;
             /**
-             * The `workerTarget` was added from Cocos Creator 3.8.5 and it's used for nest `Tween` functionality.
+             * The `workerTarget` was added from Cocos Creator 3.8.4 and it's used for nest `Tween` functionality.
              * It stores the target of sub-tween and its value may be different from `target`.
              *
              * Example 1:
              * ```ts