remove unused import

rust/src/log/mod.rs

@@ -1,6 +1,6 @@
 use serde::Serialize;
 use std::{collections::HashMap, sync::Mutex};
-use strum::{EnumIter, IntoEnumIterator};
+use strum::EnumIter;
 use strum_macros::IntoStaticStr;
 
 use esp_idf_svc::systime::EspSystemTime;