Bump Rust to 1.91.1 (#42561)

Release Notes:

- N/A

---------

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

crates/call/src/call_impl/room.rs

@@ -1683,7 +1683,9 @@ impl LiveKitRoom {
     }
 }
 
+#[derive(Default)]
 enum LocalTrack<Stream: ?Sized> {
+    #[default]
     None,
     Pending {
         publish_id: usize,
@@ -1694,12 +1696,6 @@ enum LocalTrack<Stream: ?Sized> {
     },
 }
 
-impl<T: ?Sized> Default for LocalTrack<T> {
-    fn default() -> Self {
-        Self::None
-    }
-}
-
 #[derive(Copy, Clone, PartialEq, Eq)]
 pub enum RoomStatus {
     Online,