Bump actions/checkout from 5 to 6 (#36)

Author: dependabot[bot]

.github/workflows/push.yml

@@ -11,7 +11,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       # Install dependencies
       - name: Setup latest Node.js