fix(router_env): fix opentelemetry traces for router_env (#201)

Co-authored-by: Nishant Joshi <nishant.joshi@juspay.in>

crates/router/src/core/mandate.rs

@@ -1,5 +1,5 @@
 use error_stack::{report, ResultExt};
-use router_env::{logger, tracing, tracing::instrument};
+use router_env::{instrument, logger, tracing};
 use storage_models::enums as storage_enums;
 
 use super::payments::helpers;