build(deps): bump docker/build-push-action from 2.8.0 to 2.9.0 (#28719)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.8.0 to 2.9.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](1814d3dfb3...7f9d37fa54)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/build-containers.yml

@@ -81,7 +81,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Build & Deploy ${{ matrix.dockerfile[1] }}
-        uses: docker/build-push-action@1814d3dfb36d6f84174e61f4a4b05bd84089a4b9 # @v2
+        uses: docker/build-push-action@7f9d37fa544684fb73bfe4835ed7214c255ce02b # @v2
         with:
           file: share/spack/docker/${{matrix.dockerfile[1]}}
           platforms: ${{ matrix.dockerfile[2] }}