Merge pull request #91 from input-output-hk/dependabot/github_actions/actions/checkout-4

[CI] Bump actions/checkout from 3 to 4

Author: jorisdral

.github/workflows/documentation.yml

@@ -38,7 +38,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup Haskell
       id: setup-haskell
@@ -99,7 +99,7 @@ jobs:
 
     steps:
       - name: Checkout
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Setup Pages
         uses: actions/configure-pages@v3