Update secrets-scanner.yml workflow

Author: tinyfish-github-terraform[bot]

.github/workflows/secrets-scanner.yml

@@ -14,7 +14,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - name: Checkout code
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0
       - name: TruffleHog OSS