fix(Swipe): overflow lose efficacy in iOS safari (#9933)

* fix(Swipe): issue #9931 `overflow` lose efficacy in  ios/safari

* Update index.less

Co-authored-by: neverland <chenjiahan@buaa.edu.cn>

src/swipe/index.less

@@ -3,6 +3,8 @@
 .van-swipe {
   position: relative;
   overflow: hidden;
+  // https://github.com/youzan/vant/issues/9931
+  transform: translateZ(0);
   cursor: grab;
   user-select: none;