bump codecov action version

Author: chriscardillo

.github/workflows/build.yml

@@ -33,7 +33,7 @@ jobs:
       run: |
         pytest --cov=./ --cov-report=xml
     - name: Upload coverage
-      uses: codecov/codecov-action@v3
+      uses: codecov/codecov-action@v4
       with:
         token: ${{ secrets.CODECOV_TOKEN }}
         file: ./coverage.xml