xpc: hacky implementation of GetVersion

Cargo.lock

@@ -1301,13 +1301,14 @@ version = "0.1.0"
 dependencies = [
  "anyhow",
  "async-trait",
+ "block",
  "clap 4.5.20",
  "dbus",
  "dbus-codegen",
  "dbus-tree",
  "dotenv",
  "env_logger 0.11.8",
- "futures-preview",
+ "futures",
  "futures-util",
  "kordophone",
  "kordophone-db",
@@ -1318,6 +1319,7 @@ dependencies = [
  "time",
  "tokio",
  "xpc-connection",
+ "xpc-connection-sys",
 ]
 
 [[package]]