Update actions/checkout action to v6

Author: renovate[bot]

.github/workflows/test.yml

@@ -16,7 +16,7 @@ jobs:
     timeout-minutes: 30
 
     steps:
-      - uses: actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd # v5
+      - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6
 
       - name: Node setup
         uses: actions/setup-node@a0853c24544627f65ddf259abe73b1d18a591444 # v5