[rust] Add xz2 dependency

The xz2 crate is already in the dependency tree,
so use it for implementing a xz uncompressor.

Author: bgermann

rust/Cargo.lock

@@ -30,6 +30,7 @@ exitcode = "1.1.2"
 toml = "0.8.19"
 bzip2 = "0.4.4"
 sevenz-rust = "0.6.1"
+xz2 = "0.1.7"
 walkdir = "2.5.0"
 debpkg = "0.6.0"
 anyhow = { version = "1.0.89", default-features = false, features = ["backtrace", "std"] }