chore: Prepare for Rust edition bump to 2024 (without autofix) (#27791)

Successor to #27779 - in this PR I've applied changes manually, without
futzing with if let lifetimes at all.

Release Notes:

- N/A

crates/livekit_client/src/livekit_client/playback.rs

@@ -427,7 +427,7 @@ impl libwebrtc::native::audio_mixer::AudioMixerSource for AudioMixerSource {
 
 pub fn play_remote_video_track(
     track: &crate::RemoteVideoTrack,
-) -> impl Stream<Item = RemoteVideoFrame> {
+) -> impl Stream<Item = RemoteVideoFrame> + use<> {
     #[cfg(target_os = "macos")]
     {
         let mut pool = None;
@@ -660,7 +660,7 @@ mod macos {
         callback: *mut ::std::os::raw::c_void,
     ) -> OSStatus {
         let wrapper = callback as *mut PropertyListenerCallbackWrapper;
-        (*wrapper).0();
+        unsafe { (*wrapper).0() };
         0
     }
 

crates/livekit_client/src/mock_client.rs

@@ -33,6 +33,6 @@ impl Into<gpui::SurfaceSource> for RemoteVideoFrame {
 }
 pub(crate) fn play_remote_video_track(
     _track: &crate::RemoteVideoTrack,
-) -> impl futures::Stream<Item = RemoteVideoFrame> {
+) -> impl futures::Stream<Item = RemoteVideoFrame> + use<> {
     futures::stream::pending()
 }