[Replacement]: `is-posix-bracket`

### Package to replace

`is-posix-bracket`

### Suggested replacement(s)

```js
const isPosixBracket = (str) =>
  typeof str === 'string' && /\[([:.=+])(?:[^\[\]]|)+\1\]/.test(str);
```

### Manifest type

micro-utility (tiny utility replaceable with native code or removal)

### Rationale

trivially inlinable

### Availability

_No response_

### Code example (optional)

```js

```