OWNERS: api-approvers should be approvers on cri-api

api-approvers have approval over cri-api as well, even if the individuals
listed in the group are the primaries and should be used for all targeted
changes. Came up while a global API change was proceeding which impacted
godeps.

Author: smarterclayton

staging/src/k8s.io/cri-api/OWNERS

@@ -8,6 +8,8 @@ approvers:
 - dchen1107
 - yujuhong
 - resouer
+- sig-node-api-approvers
+- api-approvers
 reviewers:
 - sig-node-reviewers
 - dims