chore(deps): update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/node.js-ci.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.event_name != 'pull_request' }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         name: Checkout [main]
         with:
           fetch-depth: 0
@@ -50,7 +50,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.event_name == 'pull_request' }}
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
         with:
           ref: ${{ github.event.pull_request.head.ref }}
           repository: ${{ github.event.pull_request.head.repo.full_name }}