Bump docker/build-push-action from 3 to 6 (#4)

Bumps [docker/build-push-action](https://github.com/docker/build-push-action) from 3 to 6.
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v3...v6)

---
updated-dependencies:
- dependency-name: docker/build-push-action
  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/cicd.yml

@@ -48,7 +48,7 @@ jobs:
             type=semver,pattern={{major}}
 
       - name: Build Docker image
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         with:
           context: ./
           file: ./Dockerfile
@@ -68,7 +68,7 @@ jobs:
           password: ${{ secrets.DOCKERHUB_TOKEN }}
 
       - name: Push Docker image to DockerHub
-        uses: docker/build-push-action@v3
+        uses: docker/build-push-action@v6
         if: github.event_name != 'pull_request'
         with:
           context: ./