chore(deps): update actions/checkout action to v7

Author: renovate[bot]

.github/workflows/website.yml

@@ -51,7 +51,7 @@ jobs:
         fetch-depth: 0
 
     - name: Checkout Diffutils Repository
-      uses: actions/checkout@v6
+      uses: actions/checkout@v7
       with:
         repository: uutils/diffutils
         path: './diffutils'