Automatic merge from submit-queue (batch tested with PRs 38957, 41819, 41851, 40667, 41373)

Bump GCI to gci-stable-56-9000-84-2

Changelogs since gci-beta-56-9000-80-0:

- Fixed google-accounts-daemon breaks on GCI when network is unavailable.
- Fixed iptables-restore performance regression.

cc/ @adityakali @Random-Liu @fabioy