build(deps): update nix requirement from ^0.20 to ^0.22

[dependabot-preview]

Updates the requirements on nix to permit the latest version.

Changelog

Sourced from nix's changelog.

[0.22.0] - 9 July 2021

Added

• Added if_nameindex (#1445)
• Added nmount for FreeBSD. (#1453)
• Added IpFreebind socket option (sockopt) on Linux, Fuchsia and Android. (#1456)
• Added TcpUserTimeout socket option (sockopt) on Linux and Fuchsia. (#1457)
• Added renameat2 for Linux (#1458)
• Added RxqOvfl support on Linux, Fuchsia and Android. (#1455)

Changed

• ptsname_r now returns a lossily-converted string in the event of bad UTF, just like ptsname. (#1446)
• Nix's error type is now a simple wrapper around the platform's Errno. This means it is now Into<std::io::Error>. It's also Clone, Copy, Eq, and has a small fixed size. It also requires less typing. For example, the old enum variant nix::Error::Sys(nix::errno::Errno::EINVAL) is now simply nix::Error::EINVAL. (#1446)

Fixed

Removed

[0.21.0] - 31 May 2021

Added

• Added getresuid and getresgid (#1430)
• Added TIMESTAMPNS support for linux (#1402)
• Added sendfile64 (#1439)
• Added MS_LAZYTIME to MsFlags (#1437)

Changed

• Made forkpty unsafe, like fork (#1390)
• Made Uid, Gid and Pid methods from_raw and as_raw a const fn (#1429)
• Made Uid::is_root a const fn (#1429)
• AioCb is now always pinned. Once a libc::aiocb gets sent to the kernel, its address in memory must not change. Nix now enforces that by using std::pin. Most users won't need to change anything, except when using aio_suspend. See that method's documentation for the new usage. (#1440)

... (truncated)

Commits

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