Revert "chore: update format! macro use to satisfy latest clippy version (#194)" (#196)

This reverts commit f29de67f1f.

substreams/ethereum-uniswap-v2/src/modules/3_map_pool_events.rs

@@ -95,7 +95,7 @@ fn handle_sync(
             });
 
         for (i, reserve_bytes) in reserves_bytes.iter().enumerate() {
-            let attribute_name = format!("reserve{i}");
+            let attribute_name = format!("reserve{}", i);
             // By using a HashMap, we can overwrite the previous value of the reserve attribute if
             // it is for the same pool and the same attribute name (reserves).
             tx_change.entity_changes.insert(

substreams/ethereum-uniswap-v2/src/store_key.rs

@@ -5,7 +5,7 @@ pub enum StoreKey {
 
 impl StoreKey {
     pub fn get_unique_pool_key(&self, key: &str) -> String {
-        format!("{prefix}:{key}", prefix = self.unique_id())
+        format!("{}:{}", self.unique_id(), key)
     }
 
     pub fn unique_id(&self) -> String {