benches: Use black_box() from std::hint

Author: Turbo87

crates/crates_io_cdn_logs/benches/count_downloads.rs

@@ -1,5 +1,6 @@
+use std::hint::black_box;
 use crates_io_cdn_logs::{cloudfront, fastly};
-use criterion::{black_box, criterion_group, criterion_main, Criterion};
+use criterion::{criterion_group, criterion_main, Criterion};
 use std::io::Cursor;
 
 fn criterion_benchmark(c: &mut Criterion) {