⬆️ upgrade actions/checkout action to v6

Author: renovate[bot]

.github/workflows/checks.yml

@@ -13,7 +13,7 @@ jobs:
 
     steps:
       - name: Checkout repo
-        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4
+        uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v6
 
       - name: Install pnpm
         uses: pnpm/action-setup@v4