refactor: Update usage of Clap in Indexer example (#3385)

Author: khorolets

tools/indexer/example/src/main.rs

@@ -1,6 +1,6 @@
 use actix;
 
-use clap::derive::Clap;
+use clap::Clap;
 use tokio::sync::mpsc;
 use tracing::info;