A11y: Badge font-scaling handling doesn't work on iOS

### Current behaviour

The Badge component attemtps to account for font-scaling in badge text by adjusting line-height. This works (at least at font-scales <= 1.5, the max we allow on our app) on Android well, but not at all on iOS.

### Expected behaviour
Ideally the badge number would be visible on both Android and iOS.

### How to reproduce?

```tsx

{notificationsUnread.length}

```

Then, on iOS, under Accessibility -> Allow Large Fonts -> Font Scale, set it to large (>= 1.5).

### Preview
Android:

iOS:

### What have you tried so far?

Tried adjusting `fontSize`, `height`, `width`, etc. by `fontScale`, which is already available in the component, which did not help; tried adjusting the line height (removing the `/ font scale`), which got closer; tried passing a `` child with `allowFontScaling={false}`, which, again, got closer.

### Your Environment

| software | version
| --------------------- | -------
| ios | latest
| android | x
| react-native | 0.73.6
| react-native-paper | 5.12.3
| node | x.x.x
| npm or yarn | x.x.x
| expo sdk | x.x.x

首先定位 Badge 组件及其现有的 fontScale 和 line-height 处理方式。在 Font Scale 设置为至少 1.5 的 iOS 上复现该问题，然后将 Badge 的渲染结果与 Android 进行比较。当在所述的大字体设置下，两个平台上的徽章数字都能保持可见时，即表示完成。

由索引模型根据 Issue 内容生成。