Backport official GLib iterator safety fix for Linux desktop

apps/desktop/src-tauri/vendor/glib/src/date_time.rs

@@ -0,0 +1,15 @@
+// Take a look at the license at the top of the repository in the LICENSE file.
+
+#[cfg(test)]
+mod tests {
+    use crate::{prelude::*, DateTime};
+
+    #[test]
+    fn test_value() {
+        let dt1 = DateTime::now_utc().unwrap();
+        let v = dt1.to_value();
+        let dt2 = v.get::<&DateTime>().unwrap();
+
+        assert_eq!(dt1.as_ptr(), dt2.as_ptr());
+    }
+}