chore(release): 9.0.4 [skip ci]

## [9.0.4](https://gitlab.com/to-be-continuous/kubernetes/compare/9.0.3...9.0.4) (2026-01-06)

### Bug Fixes

* **bash mode:** unmask errors in shell pipelines with 'set -o pipefail' ([e41455d7](https://gitlab.com/to-be-continuous/kubernetes/commit/e41455d7ac2f2d35ace4591f1c86cb21c1562ead))