Cargo: replace users with uzers

Crate `users` is unmaintained, so it is not possible to resolve
a security issue of the crate.
https://github.com/flatcar/update-ssh-keys/security/dependabot/4.

So it is necessary to use instead an actively maintained fork, `uzers`.

Cargo.toml

@@ -13,8 +13,8 @@ fs2 = "0.4"
 # Public dependencies, exposed through library API.
 error-chain = { version = "0.12", default-features = false }
 openssh-keys = { git = "https://github.com/pothos/openssh-keys", branch = "add-sk-keys" }
-users = "0.9"
 clap = { version = "4.4.6", features = ["cargo"] }
+uzers = "0.11.3"
 
 [[bin]]
 name = "update-ssh-keys"

src/lib.rs

@@ -30,7 +30,7 @@
 extern crate error_chain;
 extern crate fs2;
 extern crate openssh_keys;
-extern crate users;
+extern crate uzers;
 
 pub mod errors {
     error_chain! {
@@ -64,8 +64,8 @@ use std::collections::HashMap;
 use std::fs::{self, File};
 use std::io::{BufRead, BufReader, Read, Write};
 use std::path::{Path, PathBuf};
-use users::os::unix::UserExt;
-use users::{switch, User};
+use uzers::os::unix::UserExt;
+use uzers::{switch, User};
 
 const SSH_DIR: &str = ".ssh";
 const AUTHORIZED_KEYS_DIR: &str = "authorized_keys.d";

src/main.rs

@@ -20,7 +20,7 @@ extern crate clap;
 #[macro_use]
 extern crate error_chain;
 extern crate openssh_keys;
-extern crate users;
+extern crate uzers;
 
 extern crate update_ssh_keys;
 
@@ -29,7 +29,7 @@ use std::fs::File;
 use std::path::PathBuf;
 use update_ssh_keys::errors::*;
 use update_ssh_keys::*;
-use users::get_current_username;
+use uzers::get_current_username;
 
 #[derive(Clone, Debug)]
 struct Config {
@@ -62,7 +62,7 @@ quick_main!(run);
 fn run() -> Result<()> {
     let config = config().chain_err(|| "command line configuration")?;
 
-    let user = users::get_user_by_name(&config.user)
+    let user = uzers::get_user_by_name(&config.user)
         .ok_or_else(|| format!("failed to find user with name '{}'", config.user))?;
 
     let mut aks = AuthorizedKeys::open(user, true, config.ssh_dir.clone()).chain_err(|| {