Bump docker/setup-buildx-action from 1 to 2 in /.github/workflows

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 1 to 2.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](https://github.com/docker/setup-buildx-action/compare/v1...v2)

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

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/docker-pr.yml

@@ -26,7 +26,7 @@ jobs:
       - name: setup platform emulator
         uses: docker/setup-qemu-action@v2
       - name: setup multi-arch docker build
-        uses: docker/setup-buildx-action@v1
+        uses: docker/setup-buildx-action@v2
       - name: build & push images
         uses: docker/build-push-action@v4
         with: