ci(codecov-action) Bump v4 -> v5

See also:
- https://github.com/codecov/codecov-action
- https://github.com/codecov/codecov-action/releases/tag/v5.0.0

Author: tony

.github/workflows/tests.yml

@@ -78,7 +78,7 @@ jobs:
           tmux -V
           poetry run py.test --cov=./ --cov-report=xml
 
-      - uses: codecov/codecov-action@v4
+      - uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}