Re: [whatwg/dom] Add AbortSignal.any() (PR #1152)

I'm confused by the fact that dependent signals is a weak set, because it seems like it might prevent the `abort` event from being fired in cases like this:

```js
const ac = new AbortController();

AbortSignal.any([ac.signal]).onabort = () => {
  doSomething();
};

// The signal returned from AbortSignal.any could be collected at some
// point between the end of this script and the click event.

buttonEl.onclick = () => ac.abort();
```

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