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

Author: renovate[bot]

.github/workflows/docker.yml

@@ -11,7 +11,7 @@ jobs:
 
     steps:
       - name: Checkout 🛎️
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
 
       - name: Docker Metadata 🧾
         uses: docker/metadata-action@v5