trait: Update to use new refresh_cpu_usage

Signed-off-by: Patrick José Pereira <[email protected]>

src/traits.rs

@@ -746,7 +746,7 @@ pub trait SystemExt: Sized + Debug + Default + Send + Sync {
     /// ```
     fn refresh_system(&mut self) {
         self.refresh_memory();
-        self.refresh_cpu();
+        self.refresh_cpu_usage();
         self.refresh_components();
     }