checkout v6

Author: starswan

.github/actions/check-broken-links/action.yml

@@ -13,7 +13,7 @@ runs:
   using: composite
   steps:
     - name: Checkout code
-      uses: actions/checkout@v2
+      uses: actions/checkout@v6
 
     - name: Prepare application environment
       uses: ./.github/actions/prepare-app-env