Do not use the token

Author: vkarak

.github/workflows/codecov.yaml

@@ -19,5 +19,5 @@ jobs:
         ./test_reframe.py --cov=reframe --cov-report=xml
     - name: Upload coverage reports
       uses: codecov/[email protected]
-      env:
-        CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}
+      # env:
+      #   CODECOV_TOKEN: ${{ secrets.CODECOV_TOKEN }}