Try this

Author: wtgodbe

.github/policies/resourceManagement.yml

@@ -156,6 +156,8 @@ configuration:
       - isNotDraftPullRequest
       - isPullRequest
       - isOpen
+      - targetsBranch:
+
       - noActivitySince:
           days: 7
       - isNotLabeledWith:
@@ -200,6 +202,8 @@ configuration:
       filters:
       - isPullRequest
       - isOpen
+      - targetsBranch:
+          branch: main
       - hasLabel:
           label: 'Type: Dependency Update :arrow_up_small:'
       - noActivitySince: