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>

proxmox-backup-client/src/benchmark.rs

@@ -267,7 +267,7 @@ fn test_crypt_speed(
 
     let crypt_config = CryptConfig::new(testkey)?;
 
-    //let random_data = proxmox::sys::linux::random_data(1024*1024)?;
+    //let random_data = proxmox_sys::linux::random_data(1024*1024)?;
     let mut random_data = vec![];
         // generate pseudo random byte sequence
         for i in 0..256*1024 {