Bump docker/build-push-action from 4 to 6 (#3)

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

.github/workflows/image-publish.yml

@@ -278,7 +278,7 @@ jobs:
           docker-images: false
       - uses: docker/setup-buildx-action@v3
       - id: build
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           context: .
           platforms: ${{ matrix.platform }}