fix more zizmor initial issues after merge conflict resolution

Author: derrickaw

.github/workflows/tour_of_beam_backend.yml

@@ -42,6 +42,8 @@ jobs:
         working-directory: ./learning/tour-of-beam/backend
     steps:
       - uses: actions/checkout@v7
+        with:
+          persist-credentials: false
       - uses: actions/setup-go@v7
         with:
           # pin to the biggest Go version supported by Cloud Functions runtime