Update Codecov config after v5 update

Author: Jean85

.github/workflows/continuous-integration.yml

@@ -58,7 +58,7 @@ jobs:
       - name: "Upload coverage"
         uses: codecov/codecov-action@v5
         with:
-          file: './coverage.xml'
+          files: './coverage.xml'
           fail_ci_if_error: true
           token: ${{ vars.CODECOV_TOKEN }}