Renovate: Update actions/upload-artifact action to v5

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -67,7 +67,7 @@ jobs:
       - name: Run tests and generate coverage report
         run: make build/cover.out
       - name: Archive code coverage results
-        uses: actions/upload-artifact@v4
+        uses: actions/upload-artifact@v5
         with:
           name: code-coverage
           path: build/cover.out