Update nix requirement from 0.23 to 0.25

[dependabot[bot]]

Updates the requirements on nix to permit the latest version.

Changelog

Sourced from nix's changelog.

[0.25.0] - 2022-08-13

Added

• Added faccessat (#1780)
• Added memfd on Android. (#1773)
• Added ETH_P_ALL to SockProtocol enum (#1768)
• Added four non-standard Linux SysconfVar variants (#1761)
• Added const constructors for TimeSpec and TimeVal (#1760)
• Added chflags. (#1758)
• Added aio_writev and aio_readv. (#1713)
• impl From<uid_t> for Uid and From<gid_t> for Gid (#1727)
• impl From<SockaddrIn> for std::net::SocketAddrV4 and impl From<SockaddrIn6> for std::net::SocketAddrV6. (#1711)
• Added support for the x86_64-unknown-haiku target. (#1703)
• Added ptrace::read_user and ptrace::write_user for Linux. (#1697)
• Added getrusage and helper types UsageWho and Usage (#1747)
• Added the DontRoute SockOpt (#1752)
• Added signal::SigSet::from_sigset_t_unchecked(). (#1741)
• Added the Ipv4OrigDstAddr sockopt and control message. (#1772)
• Added the Ipv6OrigDstAddr sockopt and control message. (#1772)
• Added the Ipv4SendSrcAddr control message. (#1776)

Changed

• Rewrote the aio module. The new module:
  • Does more type checking at compile time rather than runtime.
  • Gives the caller control over whether and when to Box an aio operation.
  • Changes the type of the priority arguments to i32.
  • Changes the return type of aio_return to usize. (#1713)
• nix::poll::ppoll: sigmask parameter is now optional. (#1739)
• Changed gethostname to return an owned OsString.

... (truncated)

Commits

• 4d4754a (cargo-release) version 0.25.0
• 9a0083d Merge #1795
• 92c76bd [skip ci] reformat CHANGELOG prior to 0.25.0 release
• e4eeb9a Merge #1794
• 42ca951 Reenable cargo-hack in CI
• 5252f7e Merge #1782
• 29fe67d feat nix-rust#1733: add F_GET_SEALS and F_ADD_SEALS on FreeBSD
• ffc793e Merge #1776
• a9861d8 Merge #1785
• 217c3b5 fix CI error
• Additional commits viewable in compare view

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