ci: remove manually specifying GITHUB_TOKEN in scorecard action

The `ossf/scorecard-action` action will automatically use the builtin
GITHUB_TOKEN as needed.

Author: clydin

.github/workflows/scorecard.yml

@@ -32,7 +32,6 @@ jobs:
         with:
           results_file: results.sarif
           results_format: sarif
-          repo_token: ${{ secrets.GITHUB_TOKEN }}
           publish_results: true
 
       # Upload the results as artifacts.