chore: update actions/setup-node action to v6 (#53)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/ci.yml

@@ -13,7 +13,7 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - name: Setup Node.js
-        uses: actions/setup-node@v5
+        uses: actions/setup-node@v6
         with:
           node-version: 'lts/*'
       - name: Install dependencies
@@ -34,7 +34,7 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
     - uses: actions/checkout@v5
-    - uses: actions/setup-node@v5
+    - uses: actions/setup-node@v6
       with:
         node-version: ${{ matrix.node }}
     - name: Install dependencies

.github/workflows/release-please.yml

@@ -26,7 +26,7 @@ jobs:
             ]
       - uses: actions/checkout@v5
         if: ${{ steps.release.outputs.release_created }}
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: lts/*
           registry-url: https://registry.npmjs.org