gateway: bump docker/build-push-action from 7.0.0 to 7.1.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 7.0.0 to 7.1.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@d08e5c3...bcafcac)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  dependency-version: 7.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/dummy.yml

@@ -98,7 +98,7 @@ jobs:
         if: false
       - uses: dawidd6/action-send-mail@d38f3f7cd391cdebfe0d38efc3998b935e951c4f  # v16
         if: false
-      - uses: docker/build-push-action@d08e5c354a6adb9ed34480a06d141179aa583294  # v7.0.0
+      - uses: docker/build-push-action@bcafcacb16a39f128d818304e6c9c0c18556b85f  # v7.1.0
         if: false
       - uses: docker/login-action@4907a6ddec9925e35a0a9e82d7399ccc52663121  # v4.1.0
         if: false