libs: Fix clippy into_iter_on_ref

Fix `into_iter_on_ref` clippy warning as suggested by rust 1.85.1, since
`mem-agent` is now a member of `libs` workspace.

```console
error: this `.into_iter()` call is equivalent to `.iter_mut()` and will not consume the `Vec`
    --> mem-agent/src/memcg.rs:1122:27
     |
1122 |         for info in infov.into_iter() {
     |                           ^^^^^^^^^ help: call directly: `iter_mut`
     |
     = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#into_iter_on_ref
     = note: `-D clippy::into-iter-on-ref` implied by `-D warnings`
     = help: to override `-D warnings` add `#[allow(clippy::into_iter_on_ref)]`
```

Signed-off-by: Ruoqing He <heruoqing@iscas.ac.cn>

src/libs/mem-agent/src/memcg.rs

@@ -1119,7 +1119,7 @@ impl MemCG {
         }
 
         let psi_path = self.memcgs.blocking_read().config.psi_path.clone();
-        for info in infov.into_iter() {
+        for info in infov.iter_mut() {
             info.eviction = Some(EvictionInfo {
                 psi: psi::Period::new(&psi_path.join(info.path.trim_start_matches('/')), false),
                 last_min_lru_file: 0,