Update dependencies

This commit can be replicated with the following commands:

```
$ cargo update -p tar
    Updating tar v0.4.26 -> v0.4.37
$ cargo update -p tokio
    Updating tokio v1.4.0 -> v1.10.0
$ cargo update -p hyper:0.14.4 --precise 0.14.11
    Updating h2 v0.3.1 -> v0.3.3
    Updating httparse v1.3.4 -> v1.4.1
    Updating httpdate v0.3.2 -> v1.0.1
    Updating hyper v0.14.4 -> v0.14.11
    Removing pin-project v1.0.5
    Removing pin-project-internal v1.0.5
      Adding socket2 v0.4.1
    Updating winapi v0.3.8 -> v0.3.9
```

Author: jyn514