Update dependency @types/react-dom to v16.8.4

[renovate[bot]]

This PR contains the following updates:

Package	Type	Update	Change
@types/react-dom	devDependencies	minor	16.0.11 -> 16.8.4

---

Renovate configuration

:date: Schedule: At any time (no schedule defined).

:vertical_traffic_light: Automerge: Disabled by config. Please merge this manually once you are satisfied.

:recycle: Rebasing: Whenever PR becomes conflicted, or if you modify the PR title to begin with "rebase!".

:no_bell: Ignore: Close this PR and you won't be reminded about this update again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Renovate Bot. View repository job log here.