chore: fix unstable code use error

Author: suchapalaver

crates/attestation/src/lib.rs

@@ -191,7 +191,7 @@ fn wallet_for_allocation(
 
             let wallet_address = wallet.address();
 
-            if i < 5 || i.is_multiple_of(20) {
+            if i < 5 || (i % 20 == 0) {
                 // Log first 5 attempts and every 20th attempt
                 tracing::debug!(
                     "Derivation attempt: epoch={}, index={}, derived_address={}, target_allocation={}",

crates/tap-agent/src/agent/sender_allocation_task.rs

@@ -636,7 +636,7 @@ impl<T: NetworkVersion> SenderAllocationTask<T> {
         );
 
         // Simulate potential aggregator communication failure (5% chance)
-        if state.unaggregated_fees.counter.is_multiple_of(20) {
+        if state.unaggregated_fees.counter % 20 == 0 {
             return Err(anyhow::anyhow!(
                 "Simulated aggregator communication timeout"
             ));