fix coverage (#119)

Author: xadupre

.github/workflows/fast_tests.yml

@@ -45,12 +45,11 @@ jobs:
       - name: Run fast tests
         run: DOCLEAN=1&&pytest tests/fast -v --cov=modelbuilder --cov-report=xml --cov-report=term-missing
 
-      - name: Upload coverage to Codecov
+      - name: Upload coverage reports to Codecov
         uses: codecov/codecov-action@v5
         with:
-          files: coverage.xml
+          token: ${{ secrets.CODECOV_TOKEN }}
           flags: fast-tests
-          fail_ci_if_error: false
 
       - name: Upload stats artifact
         if: always()