Bump docker/build-push-action from 2 to 7.1.0 (#246)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2 to 7.1.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v2...v7.1.0)

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

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

Author: dependabot[bot]

.github/workflows/docker-deploy-dev.yml

@@ -30,7 +30,7 @@ jobs:
 
       - name: Build mantis
         id: build-mantis
-        uses: docker/build-push-action@v2
+        uses: docker/build-push-action@v7.1.0
         with:
           push: true
           tags: sublimesec/nginx-letsencrypt:latest