Bump Rust to 1.91.1 (#42561)

Release Notes:

- N/A

---------

Co-authored-by: Julia Ryan <juliaryan3.14@gmail.com>

crates/vim/src/state.rs

@@ -38,8 +38,9 @@ use util::rel_path::RelPath;
 use workspace::searchable::Direction;
 use workspace::{Workspace, WorkspaceDb, WorkspaceId};
 
-#[derive(Clone, Copy, Debug, PartialEq, Serialize, Deserialize)]
+#[derive(Clone, Copy, Default, Debug, PartialEq, Serialize, Deserialize)]
 pub enum Mode {
+    #[default]
     Normal,
     Insert,
     Replace,
@@ -78,12 +79,6 @@ impl Mode {
     }
 }
 
-impl Default for Mode {
-    fn default() -> Self {
-        Self::Normal
-    }
-}
-
 #[derive(Clone, Debug, PartialEq)]
 pub enum Operator {
     Change,