Update docker/setup-buildx-action action to v4

Author: renovate[bot]

.github/workflows/build.yml

@@ -113,7 +113,7 @@ jobs:
       - 
         name: Set up Docker Buildx
         if: env.exists == 'false'
-        uses: docker/setup-buildx-action@v3
+        uses: docker/setup-buildx-action@v4
       -
         name: Login into Docker Hub
         if: env.exists == 'false'

.github/workflows/docker-build.yml

@@ -19,6 +19,6 @@ jobs:
           username: voidic
           password: ${{ secrets.DOCKER_HUB_TOKEN }}
       - uses: docker/setup-qemu-action@v1
-      - uses: docker/setup-buildx-action@v1
+      - uses: docker/setup-buildx-action@v4
       - name: Build the Docker image
         run: docker buildx build -t ghcr.io/${{ github.repository_owner }}/strfry:latest --platform linux/amd64 --platform linux/arm64 --push .