Add type ascription to fix build when telemetry feature is disabled (#2235)

Author: romac

relayer/src/worker/wallet.rs

@@ -4,12 +4,11 @@ use tracing::{error_span, trace};
 
 use crate::{
     chain::handle::ChainHandle,
-    util::task::{spawn_background_task, Next, TaskHandle},
+    telemetry,
+    util::task::{spawn_background_task, Next, TaskError, TaskHandle},
 };
 
 pub fn spawn_wallet_worker<Chain: ChainHandle>(chain: Chain) -> TaskHandle {
-    use crate::{telemetry, util::task::TaskError};
-
     let span = error_span!("wallet", chain = %chain.id());
 
     spawn_background_task(span, Some(Duration::from_secs(5)), move || {
@@ -21,7 +20,7 @@ pub fn spawn_wallet_worker<Chain: ChainHandle>(chain: Chain) -> TaskHandle {
             TaskError::Ignore(format!("failed to query balance for the account: {e}"))
         })?;
 
-        let amount = balance.amount.parse().map_err(|_| {
+        let amount: u64 = balance.amount.parse().map_err(|_| {
             TaskError::Ignore(format!(
                 "failed to parse amount into u64: {}",
                 balance.amount