Update actions/checkout digest to 93cb6ef

Author: renovate[bot]

.github/workflows/syntax-validation.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
       - name: "Checkout"
-        uses: "actions/checkout@08c6903cd8c0fde910a37f88322edcfb5dd907a8" # v5
+        uses: "actions/checkout@93cb6efe18208431cddfb8368fd83d5badbf9bfd" # v5
         with:
           show-progress: false