Update nix requirement from 0.30.1 to 0.31.1 in /crates/lib

[dependabot]

Updates the requirements on nix to permit the latest version.

Changelog

Sourced from nix's changelog.

[0.31.1] - 2026-01-23

Added

• termios: Add definition for IUCLC to supported platforms (#2702)
• termios: Add definition for XCASE for supported platforms (#2703)

[0.31.0] - 2026-01-22

Added

• Added the UDP GSO/GRO socket options and CMsgs on Android. This includes the following types:

  • UdpGsoSegment
  • UdpGroSegment
  • ControlMessage::UdpGsoSegments
  • ControlMessageOwned::UdpGroSegments

  (#2666)

• Define errno EWOULDBLOCK as an alias of EAGAIN to match the AIX libc definition. (#2692)

• Enable module ifaddrs on GNU Hurd (#2697)

• Add termios OutputFlags::OFILL for Linux, Android, Aix, Cygwin, Fuchsia, Haiku, GNU/Hurd, Nto, Redox, Illumos, Solaris and Apple OSes. (#2701)

• add sync() for cygwin (#2708)

Changed

• changed EpollEvent methods to be const (#2656)
• Bumped libc to 0.2.180 (#2724)

Fixed

• Fixed nix::sys::ptrace::syscall_info, which was not setting the data argument properly, causing garbage values to be returned. (#2653)
• Cast the 'addr' argument of 'madvise()' to '*mut u8' on AIX to match the signature in the AIX libc. (#2655)
• Fixed the Dir module on NTO, Solaris, Hurd, and possibly other platforms. The

... (truncated)

Commits

• 06bb1be chore: release 0.31.1
• 49adb8d skip test::sys::test_af_alg_cipher on s390x,powerpc64le/Linux too (#2722)
• a9c73e0 termios: Add definition for XCASE (#2703)
• a69b2c1 termios: Add definition for IUCLC (#2702)
• 9ac60c5 chore: release 0.31.0
• 6789793 chore: bump libc to 0.2.180 (#2724)
• ba63e90 Update macOS runner version in workflow (#2713)
• 71f6ee9 unistd: add sync() for cygwin (#2708)
• 984420e termios: Add OFILL (#2701)
• 41e2f81 fix: make nix build on Illumos (#2694)
• Additional commits viewable in compare view

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[coveralls]

coverage: 90.073%. remained the same
when pulling fddf065 on dependabot/cargo/crates/lib/nix-0.31.1
into 7d2c23a on main.