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

@@ -50,7 +50,7 @@ jobs:
           COV_CORE_SOURCE: .
           COV_CORE_CONFIG: .coveragerc
           COV_CORE_DATAFILE: .coverage.eager
-      - uses: codecov/codecov-action@v4
+      - uses: codecov/codecov-action@v5
         with:
           token: ${{ secrets.CODECOV_TOKEN }}