chore: remove object spead (#8514)

src/checkbox/Checkbox.tsx

@@ -1,7 +1,7 @@
 import { computed, watch, defineComponent } from 'vue';
 
 // Utils
-import { createNamespace, pick } from '../utils';
+import { createNamespace, extend, pick } from '../utils';
 import {
   CHECKBOX_GROUP_KEY,
   CheckboxGroupProvide,
@@ -20,13 +20,12 @@ const [name, bem] = createNamespace('checkbox');
 export default defineComponent({
   name,
 
-  props: {
-    ...checkerProps,
+  props: extend({}, checkerProps, {
     bindGroup: {
       type: Boolean,
       default: true,
     },
-  },
+  }),
 
   emits: ['change', 'update:modelValue'],