Update cargo dependencies

[arsing]

We're behind on major versions of a bunch of deps, so it would be good to update those too.

Cargo.toml:

base64                         | ^0.13                | 0.21.0
bindgen                        | ^0.60                | 0.64.0
env_logger                     | ^0.9                 | 0.10.0
hmac                           | ^0.8                 | 0.12.1
itertools                      | ^0.8                 | 0.10.5
nix                            | ^0.24                | 0.26.2
notify                         | ^4                   | 5.1.0
serial_test                    | ^0.8                 | 1.0.0
sha2                           | ^0.9                 | 0.10.6
sysinfo                        | ^0.15.3              | 0.27.7
toml                           | ^0.5                 | 0.7.2

... and the bindgen and cbindgen versions in install-build-deps.sh

[gordonwang0]

I upgraded all of the dependencies except notify. Notify 4 --> 5 is a completely new API, and seems like it would be too much work to rewrite our code for the new API.

[arsing]

It's cargo install bindgen-cli now.