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

Author: renovate[bot]

.github/workflows/scip-docker.yml

@@ -32,7 +32,7 @@ jobs:
       - uses: docker/setup-buildx-action@v2
       - name: Build Dockerfile
         id: docker_build_autoindex
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile.autoindex
           push: false

.github/workflows/scip-release.yml

@@ -27,7 +27,7 @@ jobs:
           password: ${{ secrets.DOCKER_PASSWORD }}
       - name: Build and push
         id: docker_build_autoindex
-        uses: docker/build-push-action@v4
+        uses: docker/build-push-action@v6
         with:
           file: Dockerfile.autoindex
           push: true