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

Author: renovate[bot]

.github/workflows/update-hugo-dependencies.yml

@@ -11,7 +11,7 @@ jobs:
       contents: write
     steps:
       - name: Checkout Repository
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
 
       - name: Install Node
         uses: actions/setup-node@v5