fix lint

Author: CrazyboyQCD

src/d3d12/mod.rs

@@ -1,11 +1,13 @@
+#[cfg(feature = "std")]
+use alloc::sync::Arc;
 use alloc::{boxed::Box, string::String, vec::Vec};
 use core::{
     fmt,
     // TODO: Remove when bumping MSRV to 1.80
     mem::size_of_val,
 };
 #[cfg(feature = "std")]
-use std::{backtrace::Backtrace, sync::Arc};
+use std::backtrace::Backtrace;
 
 use log::{debug, warn, Level};
 use windows::Win32::{

src/metal/mod.rs

@@ -1,6 +1,8 @@
+#[cfg(feature = "std")]
+use alloc::sync::Arc;
 use alloc::{boxed::Box, string::ToString, vec::Vec};
 #[cfg(feature = "std")]
-use std::{backtrace::Backtrace, sync::Arc};
+use std::backtrace::Backtrace;
 
 use log::debug;
 use objc2::{rc::Retained, runtime::ProtocolObject};