Update Rust crate nix to 0.29

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
nix	dependencies	minor	0.28 -> 0.29

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Release Notes

nix-rust/nix (nix)

v0.29.0

Compare Source

Added

• Add getregset()/setregset() for Linux/glibc/x86/x86_64/aarch64/riscv64 and
  getregs()/setregs() for Linux/glibc/aarch64/riscv64
  (#​2044)
• Add socket option Ipv6Ttl for apple targets.
  (#​2287)
• Add socket option UtunIfname.
  (#​2325)
• make SigAction repr(transparent) & can be converted to the libc raw type
  (#​2326)
• Add From trait implementation for conversions between sockaddr_in and
  SockaddrIn, sockaddr_in6 and SockaddrIn6
  (#​2328)
• Add socket option ReusePortLb for FreeBSD.
  (#​2332)
• Added support for openat2 on linux.
  (#​2339)
• Add if_indextoname function.
  (#​2340)
• Add mount and unmount API for apple targets.
  (#​2347)
• Added _PC_MIN_HOLE_SIZE for pathconf and fpathconf.
  (#​2349)
• Added impl AsFd for pty::PtyMaster
  (#​2355)
• Add open flag O_SEARCH to AIX, Empscripten, FreeBSD, Fuchsia, solarish,
  WASI (#​2374)
• Add prctl function prctl_set_vma_anon_name for Linux/Android.
  (#​2378)
• Add sync(2) for apple_targets/solarish/haiku/aix/hurd, syncfs(2) for
  hurd and fdatasync(2) for aix/hurd
  (#​2379)
• Add fdatasync support for Apple targets.
  (#​2380)
• Add fcntl::OFlag::O_PATH for FreeBSD and Fuchsia
  (#​2382)
• Added PathconfVar::MIN_HOLE_SIZE for apple_targets.
  (#​2388)
• Add open flag O_SEARCH to apple_targets
  (#​2391)
• O_DSYNC may now be used with aio_fsync and fcntl on FreeBSD.
  (#​2404)
• Added Flock::relock for upgrading and downgrading locks.
  (#​2407)

Changed

• Change the ForkptyResult type to the following repr so that the
  uninitialized
  master field won't be accessed in the child process:

  pub enum ForkptyResult {
      Parent {
          child: Pid,
          master: OwnedFd,
      },
      Child,
  }
  ``` ([#​2315](https://redirect.github.com/nix-rust/nix/pull/2315))

• Updated cfg_aliases dependency from version 0.1 to 0.2
  (#​2322)

• Change the signature of ptrace::write and ptrace::write_user to make them
  safe (#​2324)

• Allow use of SignalFd through shared reference

  Like with many other file descriptors, concurrent use of signalfds is safe.
  Changing the signal mask of and reading signals from a signalfd can now be
  done
  with the SignalFd API even if other references to it exist.
  (#​2367)

• Changed tee, splice and vmsplice RawFd arguments to AsFd.
  (#​2387)

• Added I/O safety to the sys/aio module. Most functions that previously
  accepted a AsRawFd argument now accept an AsFd instead.
  (#​2401)

• RecvMsg::cmsgs() now returns a Result, and checks that cmsgs were not
  truncated. (#​2413)

Fixed

• No longer panics when the fanotify queue overflows.
  (#​2399)
• Fixed ControlMessageOwned::UdpGroSegments wrapped type from u16 to i32 to
  reflect the used kernel's one.
  (#​2406)

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