Hurd CI is broken

[SteveLauC]

CI log: https://github.com/nix-rust/nix/actions/runs/12047200511/job/33589252454?pr=2548

Error:

error[E0609]: no field `st_fsid` on type `&stat64`
   --> /home/runner/.rustup/toolchains/nightly-x86_64-unknown-linux-gnu/lib/rustlib/src/rust/library/std/src/os/hurd/fs.rs:301:36
    |
301 |         self.as_inner().as_inner().st_fsid as u64
    |                                    ^^^^^^^ unknown field
    |
help: a field with a similar name exists
    |
301 |         self.as_inner().as_inner().st_uid as u64
    |                                    ~~~~~~

Std PR that will fix the issue: rust-lang/rust#133515