Fix scorecards runs

Scorecards verifies the contents of its own executed schema, and fails with `500 server error` if there are modifications from expected structure.

See ossf/scorecard-action#1150

b/263900290

.github/workflows/scorecards.yml

@@ -31,7 +31,7 @@ jobs:
 
     steps:
       - name: "Checkout code"
-        uses: kaidokert/checkout@v3.5.999
+        uses: actions/checkout@v3
         with:
           persist-credentials: false