chore(deps): update actions/setup-node action to v6 (#471)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -16,7 +16,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: lts/*
       - run: npm ci

.github/workflows/prettier.yml

@@ -21,7 +21,7 @@ jobs:
     if: ${{ github.ref_name == 'main' }}
     steps:
       - uses: actions/checkout@v5
-      - uses: actions/setup-node@v5
+      - uses: actions/setup-node@v6
         with:
           node-version: lts/*
       - run: npm ci --ignore-scripts --only-dev