sources: fix clippy warnings for 1.73.0

sources/api/datastore/src/memory.rs

@@ -132,7 +132,7 @@ impl DataStore for MemoryDataStore {
             // Clone data key because we want the HashMap key type to be Key, not &Key, and we
             // can't pass ownership because we only have a reference from our parameters.
             .entry(data_key.clone())
-            .or_insert_with(HashMap::new);
+            .or_default();
 
         metadata_for_data.insert(metadata_key.clone(), value.as_ref().to_owned());
         Ok(())

sources/updater/updog/src/bin/updata.rs

@@ -284,7 +284,7 @@ fn main_inner() -> Result<()> {
     match cmd.cmd {
         Command::Init(args) => {
             match update_metadata::write_file(&args.file, &Manifest::default()) {
-                Ok(_) => Ok(()),
+                Ok(()) => Ok(()),
                 Err(e) => Err(error::Error::UpdateMetadata { source: e }),
             }
         }