chore: Fix warnings for Rust 1.89 (#32378)

Closes #ISSUE

Release Notes:

- N/A

crates/editor/src/selections_collection.rs

@@ -411,7 +411,7 @@ impl<'a> MutableSelectionsCollection<'a> {
         self.collection.display_map(self.cx)
     }
 
-    pub fn buffer(&self) -> Ref<MultiBufferSnapshot> {
+    pub fn buffer(&self) -> Ref<'_, MultiBufferSnapshot> {
         self.collection.buffer(self.cx)
     }