update checkout action

Author: nbarbey

.github/workflows/hugo.yaml

@@ -41,7 +41,7 @@ jobs:
 #      - name: Install Dart Sass
 #        run: sudo snap install dart-sass
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           submodules: recursive
           fetch-depth: 0