chore(actions): update actions/checkout digest to b4ffde6

Author: renovate[bot]

.github/workflows/publish-website.yaml

@@ -40,7 +40,7 @@ jobs:
         sudo snap install dart-sass-embedded
 
     - name: Checkout
-      uses: actions/checkout@8ade135a41bc03ea155e62e844d188df1ea18608 # v4
+      uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4
       with:
         submodules: recursive
         fetch-depth: 0