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

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/autofix.yml

@@ -10,7 +10,7 @@ jobs:
   autofix:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
       - uses: pnpm/action-setup@v4
       - uses: actions/setup-node@v6
         with:

.github/workflows/benchmark.yml

@@ -18,7 +18,7 @@ jobs:
       BENCHER_TESTBED: self-hosted
     steps:
       - name: Checkout
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Setup pnpm
         uses: pnpm/action-setup@v4
       - name: Setup Node.js