chore: update docker/build-push-action action to v6 (#4139)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

Diff for: .github/workflows/container-build.yml

@@ -34,7 +34,7 @@ jobs:
             type=ref,event=branch
             type=sha,prefix=,format=short
       - name: Build and push container image
-        uses: docker/build-push-action@v5
+        uses: docker/build-push-action@v6
         with:
           context: .
           file: Dockerfile.ci