fix(slider): potential drag event handler leak

src/slider/src/Slider.tsx

@@ -9,7 +9,8 @@ import {
   Transition,
   PropType,
   CSSProperties,
-  ComponentPublicInstance
+  ComponentPublicInstance,
+  onBeforeUnmount
 } from 'vue'
 import {
   VBinder,
@@ -527,6 +528,9 @@ export default defineComponent({
       }
       void nextTick(syncPosition)
     })
+    onBeforeUnmount(() => {
+      stopDragging()
+    })
     const cssVarsRef = computed(() => {
       const {
         self: {