remove incorrect lifetime annotation

[aliemjay]

Hi,
rustc was previously accepting this incorrect code:

async fn test<'a>() { // `'a`, being a lifetime parameter, must be longer than the entire function body
    let f = |_: &'a str| {}; // the argument is required to outlive `'a`
    f(&String::new()); // an argument of shorter lifetime is passed!
}

This got fixed in the current beta 1.64, but we found that wonnx relies on this bug. This PR tries to fix this.

[haixuanTao]

Thank you ❤️

[pixelspark]

Good catch, looks like that was my code 😬