Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/cleanup.yml

@@ -39,7 +39,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: Install Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 24
       - name: Setup environment

.github/workflows/quality-assurance.yml

@@ -26,7 +26,7 @@ jobs:
         with:
           python-version: "3.13"
       - name: Install Node
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 24
       - name: Setup environment