chore(deps): update actions/checkout action to v6

Author: mend-for-github-com[bot]

.github/workflows/build-image.yml

@@ -27,7 +27,7 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           fetch-depth: 0  # Full history for version detection