Update nix requirement from 0.22 to 0.23

[dependabot[bot]]

Updates the requirements on nix to permit the latest version.

Changelog

Sourced from nix's changelog.

[0.23.0] - 2021-09-28

Added

• Added the LocalPeerCred sockopt. (#1482)
• Added TimeSpec::from_duration and TimeSpec::from_timespec (#1465)
• Added IPV6_V6ONLY sockopt. (#1470)
• Added impl From<User> for libc::passwd trait implementation to convert a User into a libc::passwd. Consumes the User struct to give ownership over the member pointers. (#1471)
• Added pthread_kill. (#1472)
• Added mknodat. (#1473)
• Added setrlimit and getrlimit. (#1302)
• Added ptrace::interrupt method for platforms that support PTRACE_INTERRUPT (#1422)
• Added IP6T_SO_ORIGINAL_DST sockopt. (#1490)
• Added the PTRACE_EVENT_STOP variant to the sys::ptrace::Event enum (#1335)
• Exposed SockAddr::from_raw_sockaddr (#1447)
• Added TcpRepair (#1503)
• Enabled pwritev and preadv for more operating systems. (#1511)
• Added support for TCP_MAXSEG TCP Maximum Segment Size socket options (#1292)
• Added Ipv4RecvErr and Ipv6RecvErr sockopts and associated control messages. (#1514)
• Added AsRawFd implementation on PollFd. (#1516)
• Added Ipv4Ttl and Ipv6Ttl sockopts. (#1515)
• Added MAP_EXCL, MAP_ALIGNED_SUPER, and MAP_CONCEAL mmap flags, and exposed MAP_ANONYMOUS for all operating systems. (#1522) (#1525) (#1531) (#1534)
• Added read/write accessors for 'events' on PollFd. (#1517)

Changed

... (truncated)

Commits

• 50b4865 (cargo-release) version 0.23.0
• 1b5476a [skip ci] Change release procedure to use cargo-release
• 150579c Merge #1538 #1545 #1546
• a607034 Fix return value of posix_fadvise
• 8d6c2b3 Revert "Expose SockAddr::from_raw_sockaddr"
• 1671edc Fix memory unsafety in unistd::getgrouplist
• 759b34a Merge #1536
• af01302 Merge pull request #1543 from asomers/CHANGELOG-0.23.0
• 24803c5 [skip ci] tweak CHANGELOG formatting
• 389185e Lower limits in setrlimit example
• Additional commits viewable in compare view

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