ci: bump docker/build-push-action from 2.6.1 to 2.10.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.6.1 to 2.10.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2.6.1...v2.10.0)

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

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

.github/workflows/docker.yml

@@ -65,7 +65,7 @@ jobs:
         uses: docker/setup-buildx-action@v1
 
       - name: "Rebuild oasisprotocol/oasis-rosetta-gateway:${{ steps.branch_tag.outputs.tag }}"
-        uses: docker/build-push-action@v2.6.1
+        uses: docker/build-push-action@v2.10.0
         with:
           context: docker
           file: docker/Dockerfile