RUSTSEC-2020-0168: mach is unmaintained

[github-actions]

mach is unmaintained

Details
Status	unmaintained
Package	mach
Version	0.3.2
URL	fitzgen/mach#63
Date	2020-07-14

Last release was almost 4 years ago.

Maintainer(s) seem to be completely unreachable.

Possible Alternative(s)

These may or may not be suitable alternatives and have not been vetted in any way;

• mach2 - direct fork

See advisory page for additional details.

[tatsuya6502]

mach is used by quanta v0.10.x for macOS and iOS targets:

$ cargo tree -i mach --all-features --target aarch64-apple-darwin
mach v0.3.2
└── quanta v0.10.1
    └── moka v0.10.1

It is not used for other platforms:

$ cargo tree -i mach --all-features --target x86_64-unknown-linux-gnu
warning: nothing to print.

quanta v0.11.0 has been released and it uses mach2:

https://github.com/metrics-rs/quanta/blob/v0.11.0/Cargo.toml#L53-L57

[tatsuya6502]

This issue was addressed in Moka v0.10.2. We upgraded quanta crate to v0.11.0 (#251), which uses mach2 instead of mach.