chore(deps): update codecov/codecov-action action to v6

Author: renovate[bot]

.github/workflows/test.yaml

@@ -23,7 +23,7 @@ jobs:
         run: make ci-test
 
       - name: Send test coverage to Codecov
-        uses: codecov/codecov-action@v5
+        uses: codecov/codecov-action@v6
 
       - name: Run Trivy vulnerability scanner in repo mode
         uses: aquasecurity/trivy-action@v0.36.0