fix: array-table/main.scss mixed-decls Deprecation warning on sass@1.…

…77.7 +

see: 
https://sass-lang.com/documentation/breaking-changes/mixed-decls/#example-mixed-declarations-opt-in-scss

warning report：

```shell
Deprecation Warning: Sass's behavior for declarations that appear after nested
rules will be changing to match the behavior specified by CSS in an upcoming
version. To keep the existing behavior, move the declaration above the nested
rule. To opt into the new behavior, wrap the declaration in `& {}`.

More info: https://sass-lang.com/d/mixed-decls

    ╷
47  │ ┌           &.#{$css-prefix}formily-item-warning-help {
48  │ │             color: $form-warning-color;
49  │ │           }
    │ └─── nested rule
... │
54  │             top: 100%;
    │             ^^^^^^^^^ declaration
    ╵
    stdin 54:11  root stylesheet
```

## issues
- sass/dart-sass#2280
- vitejs/vite#7116

packages/next/src/array-table/main.scss

@@ -48,19 +48,21 @@ $array-table-prefix-cls: '#{$css-prefix}formily-array-table';
             color: $form-warning-color;
           }
 
-          min-width: 30px;
-          position: absolute;
-          font-size: 12px;
-          top: 100%;
-          width: 100%;
-          z-index: 1;
-          border-radius: 3px;
-          background-color: #fff;
-          border: 1px solid #eee;
-          padding: 6px 8px;
-          margin-top: 6px;
-          transform: translateY(0);
-          opacity: 1;
+          & {
+            min-width: 30px;
+            position: absolute;
+            font-size: 12px;
+            top: 100%;
+            width: 100%;
+            z-index: 1;
+            border-radius: 3px;
+            background-color: #fff;
+            border: 1px solid #eee;
+            padding: 6px 8px;
+            margin-top: 6px;
+            transform: translateY(0);
+            opacity: 1;
+          }
           &:after {
             content: ' ';
             background-color: #fff;