chore(deps): update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/k8s-diff.yaml

@@ -31,7 +31,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/download-artifact@v3
-      - uses: actions/setup-node@v3
+      - uses: actions/setup-node@2028fbc5c25fe9cf00d9f06a71cc4710d4507903 # v6
         with:
           node-version: 16
       - run: npm install json-diff