Update docker/setup-qemu-action action to v4

| datasource  | package                  | from | to |
| ----------- | ------------------------ | ---- | -- |
| github-tags | docker/setup-qemu-action | v3   | v4 |


Signed-off-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

.github/workflows/docker.yml

@@ -40,7 +40,7 @@ jobs:
         run: echo "${{ steps.var.outputs.nginx_version }}"
 
       - name: Setup QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
 
       - name: Docker Buildx
         uses: docker/setup-buildx-action@v4

.github/workflows/update-docker-images.yml

@@ -94,7 +94,7 @@ jobs:
         if: ${{ matrix.needs-updating == 'true' }}
 
       - name: Setup QEMU
-        uses: docker/setup-qemu-action@v3
+        uses: docker/setup-qemu-action@v4
         if: ${{ matrix.needs-updating == 'true' }}
 
       - name: Docker Buildx