chore(ci): upgrade to v5

Author: thomasrockhu-codecov

.github/workflows/ci.yml

@@ -11,6 +11,6 @@ jobs:
       - name: Run tests
         run: ./test_calculator
       - name: Upload coverage to Codecov
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         env:
           CODECOV_TOKEN: ${{ secrets.CODECOV_ORG_TOKEN }}