Update actions/checkout action to v6

Author: nextest-bot

.github/workflows/renovate.yml

@@ -27,7 +27,7 @@ jobs:
       LOG_LEVEL: ${{ github.event.inputs.log-level || 'INFO' }}
     steps:
       - name: Checkout
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
+        uses: actions/checkout@1af3b93b6815bc44a9784bd300feb67ff0d1eeb3 # v6.0.0
       - name: Self-hosted Renovate
         uses: renovatebot/github-action@13f127373fd3dc43b41b0979e37ba570d6c2b8f4 # v43.0.0
         with: