fix(updater): format Update.date to RFC 3339 (#2573)

* fix(updater): format `Update.date` to RFC 3339

* Messed up on argument in #2572

* Format

* Update example

* Avoid extra to_string

* Deprecate `Update.available`

plugins/updater/src/updater.rs

@@ -310,7 +310,8 @@ impl UpdaterBuilder {
         I: IntoIterator<Item = S>,
         S: Into<OsString>,
     {
-        self.installer_args.extend(args.into_iter().map(Into::into));
+        self.current_exe_args
+            .extend(args.into_iter().map(Into::into));
         self
     }
 }