changes: fix covector metadata for objc leak patch

Format .changes/fix-objc-retain-leak.md with valid covector front matter and package bump metadata.

This resolves CI failures in check-change-tags and covector status for this PR.

Author: krishpranav

.changes/fix-objc-retain-leak.md

@@ -1 +1,5 @@
-patch tauri-runtime-wry
+---
+"tauri-runtime-wry": patch:bug
+---
+
+Avoid leaking Objective-C objects in `WebviewMessage::WithWebview` on Apple targets by replacing `Retained::into_raw` with scoped retained bindings and `Retained::as_ptr` pointer handoff.