chore(deps): Update objc2 to 0.6 (#2469)

plugins/updater/src/updater.rs

@@ -4,7 +4,7 @@
 
 use std::{
     collections::HashMap,
-    ffi::{OsStr, OsString},
+    ffi::OsString,
     io::Cursor,
     path::{Path, PathBuf},
     str::FromStr,
@@ -12,6 +12,9 @@ use std::{
     time::Duration,
 };
 
+#[cfg(not(target_os = "macos"))]
+use std::ffi::OsStr;
+
 use base64::Engine;
 use futures_util::StreamExt;
 use http::HeaderName;