update actions to new version:

- checkout: v6
- setup-buildx-action: v4
- login-action: v4
- build-push-action: v7

.gitea/workflows/prod-docker-images.yml

@@ -10,23 +10,23 @@ jobs:
 
     steps:
       - name: Checkout repository
-        uses: actions/checkout@v4
+        uses: actions/checkout@v6
         with:
           token: '${{ secrets.ACTION_ACCESS_TOKEN }}'
           submodules: recursive
 
       - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
 
       - name: Login to Docker Hub
-        uses: docker/login-action@v3
+        uses: docker/login-action@v4
         with:
           registry: ${{ vars.DOCKER_REGISTRY_URL }}
           username: ${{ secrets.DOCKER_REGISTRY_USERNAME }}
           password: ${{ secrets.ACTION_ACCESS_TOKEN }}
 
       - name: Build and push Docker image for latest tag
-        uses: docker/build-push-action@v6
+        uses: docker/build-push-action@v7
         with:
           context: .
           push: true