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

Author: renovate[bot]

.github/workflows/node.yaml

@@ -10,7 +10,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - name: Setup node & npm
         uses: relative-ci/.github/actions/setup-node-npm@main