Add awnand to approvers for AlloyDB Omni Operator

Author: awnand

operators/alloydb-omni-operator/ci.yaml

@@ -4,4 +4,5 @@ reviewers:
 - ack-bot
 - Manvi1203
 - jahnavi2k
-- alloydb-omni-operator-bot 
+- alloydb-omni-operator-bot
+- awnand