perf(hero): 优化临时buff的更新逻辑以提升性能

将forEach循环改为倒序for循环，避免在删除元素时重复查找index，减少不必要的操作

assets/script/game/hero/HeroAttrsComp.ts

@@ -302,15 +302,13 @@ export class HeroAttrsComp extends ecs.Comp {
         // 更新临时型buff
         for (const attrIndex in this.BUFFS_TEMP) {
             const buffs = this.BUFFS_TEMP[attrIndex];
-            buffs.forEach(buff => {
+            for (let i = buffs.length - 1; i >= 0; i--) {
+                const buff = buffs[i];
                 buff.remainTime -= dt;
                 if (buff.remainTime <= 0) {
-                    const index = buffs.indexOf(buff);
-                    if (index > -1) {
-                        buffs.splice(index, 1);
-                    }
+                    buffs.splice(i, 1);
                 }
-            });
+            }
             if (buffs.length === 0) {
                 delete this.BUFFS_TEMP[attrIndex];
                 affectedAttrs.add(parseInt(attrIndex));