Bump QEMU tests Rust version to 1.89

[robamu]

I remember already changing this in a different PR.. Let's see what the GitHub CI says..

[robamu]

I looked at https://github.com/rust-lang/rust/blob/master/library/core/src/panic/location.rs now and the
relevant PanicInfo field seems to be col .. Weird that the tests are failing locally for me.

[robamu]

Oh, looked at the wrong spot:

#[stable(feature = "panic_hooks", since = "1.10.0")]
impl fmt::Debug for Location<'_> {
    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
        f.debug_struct("Location")
            .field("file", &self.file())
            .field("line", &self.line)
            .field("column", &self.col)
            .finish()
    }
}

this was added in 1.89, while 1.88 uses a Debug derive.