fix(scanner): drop the unused Digest import

Same one-line change as rustfs/rustfs#7366 (main is red with it under -D warnings); carried here so the stacked PRs' merge commits compile until that fix lands.

crates/scanner/src/scanner_folder/item_actions.rs

@@ -15,7 +15,7 @@
 use super::*;
 #[cfg(test)]
 use rustfs_filemeta::MetadataResolutionParams;
-use sha2::{Digest as _, Sha256};
+use sha2::Sha256;
 
 /// Cached folder information for scanning
 #[derive(Clone, Debug)]