ci(deps): bump docker/build-push-action from v5 to v6 (#5)

Updates `docker/build-push-action` from 5 to 6
- [Release notes](https://github.com/docker/build-push-action/releases)
- [Commits](docker/build-push-action@v5...v6)

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

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

Author: dependabot[bot]

.github/workflows/validate.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Build | Action Container
         id: container-builder
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: ./src
           load: true # add to `docker images`