fix: replace deprecated criterion::black_box with std::hint::black_box

Author: AlexMikhalev

crates/terraphim_multi_agent/benches/agent_operations.rs

@@ -1,4 +1,5 @@
-use criterion::{BenchmarkId, Criterion, black_box, criterion_group, criterion_main};
+use criterion::{BenchmarkId, Criterion, criterion_group, criterion_main};
+use std::hint::black_box;
 use std::sync::Arc;
 use tokio::runtime::Runtime;