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

Author: renovate[bot]

.github/workflows/cleanup-on-create.yaml

@@ -17,7 +17,7 @@ jobs:
     if: ${{ github.event_name == 'workflow_dispatch' || ( github.ref == 'refs/heads/main' && !(contains(github.event, 'head_commit') || github.event.head_commit.message == 'Initial commit' )) }}
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Use Node.js 20
         uses: actions/setup-node@v6
         with:

.github/workflows/main.yaml

@@ -5,7 +5,7 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-    - uses: actions/checkout@v5
+    - uses: actions/checkout@v6
     - name: Use Node.js 20
       uses: actions/setup-node@v6
       with: