Update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/run_test.yml

@@ -70,7 +70,7 @@ jobs:
         coverage xml
 
     - name: Upload coverage reports to Codecov
-      uses: codecov/codecov-action@v5
+      uses: codecov/codecov-action@v6
       with:
         fail_ci_if_error: true
         token: ${{ secrets.CODECOV_TOKEN }}