build(deps): bump nix from 0.20.0 to 0.20.2

[dependabot[bot]]

Bumps nix from 0.20.0 to 0.20.2.

Changelog

Sourced from nix's changelog.

[0.20.2] - 28 September 2021

Added

Changed

Fixed

• Fixed buffer overflow in unistd::getgrouplist. (#1545)

[0.20.1] - 13 August 2021

Added

Changed

Fixed

• Locked bitflags to < 1.3.0 to fix the build with rust < 1.46.0.

Removed

• Removed a couple of termios constants on redox that were never actually supported. (#1483)

Commits

• 72d805a (cargo-release) version 0.20.2
• 199acc7 [skip ci] update version in README
• 94ccf88 Fix memory unsafety in unistd::getgrouplist
• de534c1 Release 0.20.1
• b13f73c Fix a non_fmt_panic warning with Rustc 1.52.0
• c0a9fd7 Use memoffset::offset_of instead of homegrown macro
• e266b7c Fix test_vsock failure on VMADDR_CID_LOCAL testing
• feb8fe6 Remove some actually unsupported termios iflags on redox
• 97f6ec5 Lock bitflags to < 1.3.0 to fix the build with rust < 1.46.0
• See full diff in compare view

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