feat: update Radio content row-gap from 0 to 4px (#1699)

Co-authored-by: shijia.me <[email protected]>

packages/semi-foundation/radio/radio.scss

@@ -241,6 +241,7 @@ $inner-width: $width-icon-medium;
     &-content {
         display: flex;
         flex-direction: column;
+        row-gap: $spacing-radio_content-rowGap;
     }
 
     &:hover {

packages/semi-foundation/radio/variables.scss

@@ -77,6 +77,7 @@ $spacing-radio_addon_buttonRadio_middle-paddingX: $spacing-base; // 中尺寸按
 $spacing-radio_addon_buttonRadio_middle-paddingY: $spacing-extra-tight; // 中尺寸按钮式单选按钮垂直内边距
 $spacing-radio_addon_buttonRadio_marginLeft: $spacing-none; // 按钮式单选按钮左侧外边距
 $spacing-radio_extra-paddingLeft: $width-radio_inner + $spacing-tight; // 单选副标题左侧内边距
+$spacing-radio_content-rowGap: 4px; // 内容行间距
 
 $spacing-radio_group_vertical-marginBottom: $spacing-base-tight; // 垂直布局单选框组底部外边距
 $spacing-radio_card_group_vertical-marginBottom: $spacing-base; // 垂直布局卡片式单选框组底部外边距