clearing cache with max age

Hello,

I'm using your lib like this:
```
const memo = nanomemoize(fn, { maxAge: 7_200_000 })

memo()
...
memo.clear()
```

While calling `memo.clear()` clears the cache, the [setTimeout](https://github.com/anywhichway/nano-memoize/blob/ca71d163db33fc894584133d3dc942cfb404f382/src/index.js#L44C46-L44C46) is not cleared and the process hangs.

