Update react_on_rails to 16.3.0.rc.2

**Metr Tracking Issue**

**Category**: version_bump
**Commits**: 1
**Lines changed**: 676 (+659/-17)
**Time span**: 0 hours

**PRs**:
- #693 - Update react_on_rails to 16.3.0.rc.2

<details>
<summary>Commit details</summary>

- `8b388c9` Update react_on_rails to 16.3.0.rc.2 (#693) (+659/-17)

</details>