Bump docker/setup-buildx-action from 2 to 3 (#9)

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 2 to 3.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@v2...v3)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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Author: dependabot[bot]

.github/workflows/build.yml

@@ -42,7 +42,7 @@ jobs:
       # Workaround: https://github.com/docker/build-push-action/issues/461
       - name: Setup Docker buildx
         if: ${{ env.NGINX_VERSION != '' }}
-        uses: docker/setup-buildx-action@v2
+        uses: docker/setup-buildx-action@v3
 
       # Login against a Docker registry except on PR
       # https://github.com/docker/login-action