update to proxmox-sys 0.2 crate

- imported pbs-api-types/src/common_regex.rs from old proxmox crate
- use hex crate to generate/parse hex digest
- remove all reference to proxmox crate (use proxmox-sys and
  proxmox-serde instead)

Signed-off-by: Dietmar Maurer <dietmar@proxmox.com>

src/acme/client.rs

@@ -10,7 +10,7 @@ use hyper::{Body, Request};
 use nix::sys::stat::Mode;
 use serde::{Deserialize, Serialize};
 
-use proxmox::tools::fs::{replace_file, CreateOptions};
+use proxmox_sys::fs::{replace_file, CreateOptions};
 use proxmox_acme_rs::account::AccountCreator;
 use proxmox_acme_rs::account::AccountData as AcmeAccountData;
 use proxmox_acme_rs::order::{Order, OrderData};