[Replacement]: `fs-then-native`

### Package to replace

fs-then-native

### Suggested replacement(s)

`node:fs/promises`

### Manifest type

native (replaceable by a built-in platform feature)

### Rationale

The package is a pseudo-polyfill for a feature now widely available

### Availability

Node v14.0.0+ (the api existed a few versions before, but not under the same export)

### Code example (optional)

```js

```