revert to old codecove action

Author: liudger

.github/workflows/ci.yml

@@ -50,7 +50,7 @@ jobs:
         run: pytest --cov=bsblan --cov-report=xml
       - name: Upload coverage to Codecov
         if: matrix.python == 3.8 && matrix.os == 'ubuntu'
-        uses: codecov/codecov-action@v1
+        uses: codecov/codecov-action@v1.0.3
         with:
           token: ${{ secrets.CODECOV_TOKEN }}
           file: ./coverage.xml