Fetching a body section fails with "incomplete data, need minimum X bytes"

Running any of these:
(with any valid uid)
```rs
let mails: Vec<_> = session.uid_fetch("22213", "BODY.PEEK[1]").await?.try_collect().await?;
let mails: Vec<_> = session.uid_fetch("22213", "BODY[1]").await?.try_collect().await?;
```

causes no body, text or any other data to be parsed, and the trace shows it hitting this:
https://github.com/async-email/async-imap/blob/60ed0ffe357abffb7bdbac0b89ce49e87880a308/src/imap_stream.rs#L123

The `need minimum X bytes` is always a little lower than the size of the data returned. In this case 220 bytes returned, but it says `minimum 130`.

Run with gmail imap servers, with this crate setup:
```toml
async-imap = { version = "0.6.0", default-features = false, features = ["runtime-tokio"] }
```

calling `BODY[]` or `BODY.PEEK[]` or any other call works fine.

Connecting to the imap server directly like so:
```sh
openssl s_client -connect imap.gmail.com:993 -crlf
```
and running the same commands (with same UIDs) seems to work fine.