Update codecov/codecov-action action to v5

Author: renovate[bot]

.github/workflows/cpp-coverage.yml

@@ -45,7 +45,7 @@ jobs:
         run: make coverage
 
       - name: Upload coverage reports to Codecov with GitHub Action
-        uses: codecov/codecov-action@v4
+        uses: codecov/codecov-action@v5
         with:
           directory: ./coverage
           files: coverage/lcov.info