remove ref from scorecard.yml

Author: ChrisGe4

.github/workflows/scorecard.yml

@@ -16,8 +16,6 @@ jobs:
     steps:
     - uses: 'actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd' # ratchet:actions/checkout@v6
       with:
-        # Checkout the base repository ref, not the PR's head commit
-        ref: '${{ github.event.pull_request.base.sha }}'
         persist-credentials: false
     - name: 'Run Scorecard'
       uses: 'ossf/scorecard-action@4eaacf0543bb3f2c246792bd56e8cdeffafb205a' # ratchet:ossf/scorecard-action@v2.4.3