Fix settings2 crate tests

crates/settings2/src/settings_file.rs

@@ -1,6 +1,6 @@
 use crate::{settings_store::SettingsStore, Settings};
 use anyhow::Result;
-use fs::Fs;
+use fs2::Fs;
 use futures::{channel::mpsc, StreamExt};
 use gpui2::{AppContext, Executor};
 use std::{io::ErrorKind, path::PathBuf, str, sync::Arc, time::Duration};