chore: Fix warnings for Rust 1.89 (#32378)

Closes #ISSUE

Release Notes:

- N/A

crates/project/src/git_store/git_traversal.rs

@@ -211,7 +211,7 @@ pub struct GitEntry {
 }
 
 impl GitEntry {
-    pub fn to_ref(&self) -> GitEntryRef {
+    pub fn to_ref(&self) -> GitEntryRef<'_> {
         GitEntryRef {
             entry: &self.entry,
             git_summary: self.git_summary,

crates/project/src/project.rs

@@ -467,7 +467,7 @@ impl CompletionSource {
         }
     }
 
-    pub fn lsp_completion(&self, apply_defaults: bool) -> Option<Cow<lsp::CompletionItem>> {
+    pub fn lsp_completion(&self, apply_defaults: bool) -> Option<Cow<'_, lsp::CompletionItem>> {
         if let Self::Lsp {
             lsp_completion,
             lsp_defaults,