chore(deps): update docker/build-push-action action to v6

Author: renovate[bot]

.github/workflows/docker-build.yml

@@ -18,7 +18,7 @@ jobs:
           username: ${{ secrets.DOCKERHUB_USERNAME }}
           password: ${{ secrets.DOCKERHUB_TOKEN }}
       - name: Build and push
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           push: true
           tags: ${{ secrets.DOCKERHUB_TAGS }}