Update generate_postman_collection.yml

getting it to run again

.github/workflows/generate_postman_collection.yml

@@ -20,6 +20,7 @@ jobs:
           touch .env
           echo POSTMAN_API_KEY=${{  secrets.POSTMAN_API_KEY }} >> .env
           echo POSTMAN_WORKSPACE_ID=${{  secrets.POSTMAN_WORKSPACE_ID }} >> .env
+          echo ACTIONS_ALLOW_USE_UNSECURE_NODE_VERSION=true >> .env
       - run: npm install
       - name: Changed Files
         id: changed-files