Update the checkout action in github workflow (renovate)

Author: johan-hultberg-work

.github/workflows/build-dockerfile.yml

@@ -12,7 +12,7 @@ jobs:
         arch: ["armv7hf", "aarch64"]
     steps:
       - name: Checkout repo source code
-        uses: actions/checkout@v5
+        uses: actions/checkout@v6
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
       - name: Control that Dockerfile builds