Fix async assertions in test files (#1510)

* fix: await assertSnapshot in test files for async assertions

packages/all/test/cross-origin-iframe-packer.test.ts

@@ -149,7 +149,7 @@ describe('cross origin iframes & packer', function (this: ISuite) {
         const unpackedSnapshots = packedSnapshots.map((packed) =>
           unpack(packed),
         ) as eventWithTime[];
-        assertSnapshot(unpackedSnapshots);
+        await assertSnapshot(unpackedSnapshots);
       });
     });
   });