Bump docker/setup-buildx-action

Bumps [docker/setup-buildx-action](https://github.com/docker/setup-buildx-action) from 79abd3f86f79a9d68a23c75a09a9a85889262adf to 2. This release includes the previously tagged commit.
- [Release notes](https://github.com/docker/setup-buildx-action/releases)
- [Commits](docker/setup-buildx-action@79abd3f...dc7b971)

---
updated-dependencies:
- dependency-name: docker/setup-buildx-action
  dependency-type: direct:production
...

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

.github/workflows/publish-image.yml

@@ -46,7 +46,7 @@ jobs:
             # Workaround: https://github.com/docker/build-push-action/issues/461
             -
                 name: Setup Docker buildx
-                uses: docker/setup-buildx-action@79abd3f86f79a9d68a23c75a09a9a85889262adf
+                uses: docker/setup-buildx-action@dc7b9719a96d48369863986a06765841d7ea23f6
 
             # Login against all registries
             # https://github.com/docker/login-action