Merge pull request #580 from puppetlabs/IT-87329-run_ci_on_pr

(IT-87329) - Update workflows to run on pull_request

.github/workflows/mend.yml

 name: "mend"
 
 on:
-  pull_request_target:
-    types:
-      - opened
-      - synchronize
+  pull_request:
+    branches:
+      - "main"
   schedule:
     - cron: "0 0 * * *"
   workflow_dispatch: