test: migrate cache_lock to snapbox

Author: heisen-li

tests/testsuite/cache_lock.rs

@@ -1,7 +1,5 @@
 //! Tests for `CacheLock`.
 
-#![allow(deprecated)]
-
 use crate::config::GlobalContextBuilder;
 use cargo::util::cache_lock::{CacheLockMode, CacheLocker};
 use cargo_test_support::paths::{self, CargoPathExt};