Enable clippy::explicit_auto_deref (#8753)

This PR enables the
[`clippy::explicit_auto_deref`](https://rust-lang.github.io/rust-clippy/master/index.html#/explicit_auto_deref)
rule and fixes the outstanding violations.

Release Notes:

- N/A

crates/editor/src/editor.rs

@@ -10052,7 +10052,7 @@ impl ViewInputHandler for Editor {
                     .disjoint_anchors()
                     .iter()
                     .map(|selection| {
-                        selection.start.bias_left(&*snapshot)..selection.end.bias_right(&*snapshot)
+                        selection.start.bias_left(&snapshot)..selection.end.bias_right(&snapshot)
                     })
                     .collect::<Vec<_>>()
             };

crates/editor/src/editor_tests.rs

@@ -6774,7 +6774,7 @@ async fn test_following(cx: &mut gpui::TestAppContext) {
                 move |_, leader, event, cx| {
                     leader
                         .read(cx)
-                        .add_event_to_update_proto(event, &mut *update.borrow_mut(), cx);
+                        .add_event_to_update_proto(event, &mut update.borrow_mut(), cx);
                 },
             )
             .detach();
@@ -6943,7 +6943,7 @@ async fn test_following_with_multiple_excerpts(cx: &mut gpui::TestAppContext) {
             cx.subscribe(&leader, move |_, leader, event, cx| {
                 leader
                     .read(cx)
-                    .add_event_to_update_proto(event, &mut *update.borrow_mut(), cx);
+                    .add_event_to_update_proto(event, &mut update.borrow_mut(), cx);
             })
             .detach();
         }