chore: Bump Rust version to 1.88 (#33439)

Goodies in this version:
- if-let chains 🎉
- Better compiler perf for Zed
(https://github.com/rust-lang/rust/pull/138522)

For more, see: https://releases.rs/docs/1.88.0/

Release Notes:

- N/A

---------

Co-authored-by: Junkui Zhang <364772080@qq.com>

crates/worktree/src/worktree.rs

@@ -3911,7 +3911,7 @@ impl BackgroundScanner {
                     let Ok(request) = path_prefix_request else { break };
                     log::trace!("adding path prefix {:?}", request.path);
 
-                    let did_scan = self.forcibly_load_paths(&[request.path.clone()]).await;
+                    let did_scan = self.forcibly_load_paths(std::slice::from_ref(&request.path)).await;
                     if did_scan {
                         let abs_path =
                         {