[v16.x backport] deps: update ICU to 70.1
This is a clean cherry-pick of https://github.com/nodejs/node/pull/40658 Opened as a PR to check CI.
Do not update/delete: Banner broadcast message test data
Do not update/delete: Notification broadcast message test data
This is a clean cherry-pick of https://github.com/nodejs/node/pull/40658 Opened as a PR to check CI.