Update actions/checkout action to v7 (#634)

* Update actions/checkout action to v7

* Update .github/workflows/hugo.yml

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Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Edouard Choinière <27212526+echoix@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/hugo.yml

@@ -42,7 +42,7 @@ jobs:
       - name: Install Dart Sass
         run: sudo snap install dart-sass
       - name: Checkout
-        uses: actions/checkout@v6
+        uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
         with:
           submodules: recursive
       - name: Setup Pages