Remove unused import

sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs

diff --git a/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs b/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs
index 1fa1d61..0b3c8b6 100644
--- a/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs
+++ b/sparse_strips/vello_cpu/src/dispatch/multi_threaded.rs
@@ -17,9 +17,8 @@
 use rayon::{ThreadPool, ThreadPoolBuilder};
 use std::cell::RefCell;
 use std::ops::DerefMut;
-use std::println;
 use std::sync::atomic::{AtomicU8, Ordering};
-use std::sync::{Barrier, Mutex, OnceLock, RwLock};
+use std::sync::{Barrier, OnceLock, RwLock};
 use thread_local::ThreadLocal;
 use vello_common::coarse::{Cmd, Wide};
 use vello_common::encode::EncodedPaint;