Update actions/setup-node action to v6

Author: renovate[bot]

.github/workflows/ci.yml

@@ -34,7 +34,7 @@ jobs:
       - uses: pnpm/action-setup@v4
         with:
           version: latest
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: ${{ matrix.node-version }}
           cache: pnpm

.github/workflows/publish_release.yml

@@ -25,7 +25,7 @@ jobs:
       - uses: pnpm/action-setup@v4
         with:
           version: latest
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: 22
           registry-url: 'https://registry.npmjs.org'