chore(deps): update actions/checkout action to v6 (#1076)

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

Author: renovate[bot]

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd" # v5
+        uses: "actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd" # v6
 
       - name: "Install PHP"
         uses: "shivammathur/setup-php@44454db4f0199b8b9685a5d763dc37cbf79108e1" # v2