is_zip function might be incorrect

[sigmaSd]

The signature here https://en.wikipedia.org/wiki/List_of_file_signatures is a bit different

code:

fn is_zip(buf: &[u8]) -> bool {
        buf.len() >= 3
            && buf[..=1] == [0x50, 0x4B]
            && (buf[2..=3] == [0x3, 0x4] || buf[2..=3] == [0x5, 0x6] || buf[2..=3] == [0x7, 0x8])
}