ci: bump docker/build-push-action from 2.5.0 to 4.1.0

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 2.5.0 to 4.1.0.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@ad44023...44ea916)

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

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

.github/workflows/push-to-registry.yaml

@@ -26,7 +26,7 @@ jobs:
           images: lucaspolo/redditbot
 
       - name: Build and push Docker image
-        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
+        uses: docker/build-push-action@44ea916f6c540f9302d50c2b1e5a8dc071f15cdf
         with:
           context: .
           push: true