Clippy bump (#2877)

* Bumping clippy

* Fixing warnings

* Fix the "fix"

util/src/migration/mod.rs

@@ -231,7 +231,7 @@ impl Manager {
 		trace!(target: "migration", "Total migrations to execute for version {}: {}", version, migrations.len());
 		if migrations.is_empty() { return Err(Error::MigrationImpossible) };
 
-		let columns = migrations.iter().nth(0).and_then(|m| m.pre_columns());
+		let columns = migrations.get(0).and_then(|m| m.pre_columns());
 
 		trace!(target: "migration", "Expecting database to contain {:?} columns", columns);
 		let mut db_config = DatabaseConfig {