docs: fix cdn link (#8023)

src/checkbox/README.md

@@ -83,8 +83,8 @@ export default {
     const checked = ref(true);
     return {
       checked,
-      activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
-      inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png',
+      activeIcon: 'https://img01.yzcdn.cn/vant/user-active.png',
+      inactiveIcon: 'https://img01.yzcdn.cn/vant/user-inactive.png',
     };
   },
 };

src/checkbox/README.zh-CN.md

@@ -95,8 +95,8 @@ export default {
     const checked = ref(true);
     return {
       checked,
-      activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
-      inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png',
+      activeIcon: 'https://img01.yzcdn.cn/vant/user-active.png',
+      inactiveIcon: 'https://img01.yzcdn.cn/vant/user-inactive.png',
     };
   },
 };

src/checkbox/demo/index.vue

@@ -182,8 +182,8 @@ export default {
       setRefs,
       checkAll,
       toggleAll,
-      activeIcon: 'https://img.yzcdn.cn/vant/user-active.png',
-      inactiveIcon: 'https://img.yzcdn.cn/vant/user-inactive.png',
+      activeIcon: 'https://img01.yzcdn.cn/vant/user-active.png',
+      inactiveIcon: 'https://img01.yzcdn.cn/vant/user-inactive.png',
     };
   },
 };

src/checkbox/test/__snapshots__/demo.spec.js.snap

@@ -100,7 +100,7 @@ exports[`should render demo and match snapshot 1`] = `
        aria-checked="true"
   >
     <div class="van-checkbox__icon van-checkbox__icon--round van-checkbox__icon--checked">
-      <img src="https://img.yzcdn.cn/vant/user-active.png">
+      <img src="https://img01.yzcdn.cn/vant/user-active.png">
     </div>
     <span class="van-checkbox__label">
       Custom Icon