Fix slow animation on iOS (#6954)

## Summary

This PR adds the missing call to `calculateTimestampWithSlowAnimations`,
which is necessary to properly handle slow animations on iOS.

| before | after |
| --- | --- |
| <video
src="https://github.com/user-attachments/assets/e09f3e50-5a12-472d-aea1-71d98c1638bb"
/> | <video
src="https://github.com/user-attachments/assets/d3a6d047-d443-4f3b-9947-b6f96ee9d479"
/> |

## Test plan

Runa animation and toggle slow animation on iOS.

packages/react-native-reanimated/apple/reanimated/apple/native/PlatformDepMethodsHolderImpl.mm

@@ -93,9 +93,7 @@ RequestRenderFunction makeRequestRender(REANodesManager *nodesManager)
       // TODO macOS targetTimestamp isn't available on macOS
       auto targetTimestamp = displayLink.timestamp + displayLink.duration;
 #endif
-      double frameTimestamp =
-
-          (targetTimestamp) * 1000;
+      const double frameTimestamp = calculateTimestampWithSlowAnimations(targetTimestamp) * 1000;
       onRender(frameTimestamp);
     }];
   };