use proxmox-sys 0.2.1 and proxmox-io 1.0.1

And remove unused code from pbs-tools.

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

pbs-tools/src/lib.rs

@@ -1,12 +1,10 @@
 pub mod cert;
 pub mod crypt_config;
 pub mod format;
-pub mod io;
 pub mod json;
 pub mod lru_cache;
 pub mod nom;
 pub mod sha;
-pub mod sync;
 pub mod ticket;
 
 pub mod async_lru_cache;