Ensure Validate Pinned Actions run on master (#20245)

Author: AAraKKe

.github/workflows/validate-pinned-actions.yml

@@ -1,6 +1,9 @@
 name: Validate Pinned Actions
 on:
   pull_request: {}
+  push:
+    branches:
+      - master
   merge_group:
     # Test requested to pass before merging
     # needs to trigger in merge queues