Merge pull request #39 from ruby/dependabot/github_actions/docker/set…

…up-buildx-action-3

Bump docker/setup-buildx-action from 2 to 3

.github/workflows/publish.yml

@@ -53,7 +53,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: docker/setup-qemu-action@v2
-      - uses: docker/setup-buildx-action@v2
+      - uses: docker/setup-buildx-action@v3
       - uses: docker/login-action@v2
         with:
           username: ${{ github.actor }}