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

Author: renovate[bot]

.github/workflows/ci.yaml

@@ -19,7 +19,7 @@ jobs:
         node-version: [20.x, 24.x]
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           registry-url: https://registry.npmjs.org

.github/workflows/publish-release.yaml

@@ -58,7 +58,7 @@ jobs:
     needs: create_release
     steps:
       - uses: actions/checkout@v4
-      - uses: actions/setup-node@v4
+      - uses: actions/setup-node@v6
         with:
           node-version: 22.x
           registry-url: https://registry.npmjs.org