Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/test.yaml

@@ -13,7 +13,7 @@ jobs:
   test:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v5
+      - uses: actions/checkout@v6
 
       - uses: actions/setup-node@v6
         with: