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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -14,7 +14,7 @@ jobs:
     env:
       CHECK: "pnpm check"
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
       - name: setup pnpm
         uses: pnpm/action-setup@v4
         with: