fix: assert v2 instances

Author: ccharly

packages/keyring-controller/src/KeyringController.ts

@@ -1961,8 +1961,9 @@ export class KeyringController<
 
       // As usual, we want to prevent returning direct references to keyring instances, so we check
       // the result for any unsafe direct access before returning.
-      for (const { keyring } of this.#keyrings) {
+      for (const { keyring, keyringV2 } of this.#keyrings) {
         this.#assertNoUnsafeDirectKeyringAccess(result, keyring);
+        this.#assertNoUnsafeDirectKeyringAccess(result, keyringV2);
       }
 
       return result;