Summary:
Upgraded viper and cobra manually in `go.mod` other changes to `go.mod`
came from `make go-setup`.
Realized that etcd was out of alpha so upgraded that too.

Test Plan: Ran existing unit tests.

Reviewers: zasgar, michelle, #third_party_approvers

Reviewed By: michelle, #third_party_approvers

Differential Revision: https://phab.corp.pixielabs.ai/D9108

GitOrigin-RevId: e337fbea626f4e72f7641a9dd48f5c0e159243e5