fix: remove unused imports and fix as_ref usage

src/modes/update.rs

@@ -1,4 +1,4 @@
-use anyhow::{bail, Context, Result, ResultExt};
+use anyhow::{bail, Result};
 use std::path::PathBuf;
 use std::str::FromStr;
 
@@ -66,7 +66,7 @@ pub fn mode_update(
     }
 
     // If digest is defined and not None, but digest_value is missing, recalculate it
-    if let Some(digest_type_str) = item.digest_type.as_ref() {
+    if let Some(digest_type_str) = &item.digest_type {
         if digest_type_str != "None" && item.digest_value.is_none() {
             debug!("MAIN: Recalculating digest for item {:?}", item.id);