Excavator: Update policy-bot config (#404)

Author: svc-excavator-bot

.policy.yml

@@ -3,6 +3,7 @@
 policy:
   approval:
     - or:
+      - infrastructure-notify has been notified
       - one admin has approved (PR contributors not allowed)
       - two admins have approved
       - changelog only and contributor approval
@@ -15,12 +16,18 @@ policy:
       organizations: [ "palantir" ]
 
 approval_rules:
-
-  - name: one admin has approved (PR contributors not allowed)
+  - name: infrastructure-notify has been notified
     options:
       allow_contributor: false
       request_review:
         enabled: true
+    requires:
+      count: 1
+      teams: [ "palantir/infrastructure-notify" ]
+
+  - name: one admin has approved (PR contributors not allowed)
+    options:
+      allow_contributor: false
     requires:
       count: 1
       admins: true