chore(release): 4.8.4 [skip ci]

## [4.8.4](https://gitlab.com/to-be-continuous/dbt/compare/4.8.3...4.8.4) (2026-01-06)

### Bug Fixes

* **bash mode:** unmask errors in shell pipelines with 'set -o pipefail' ([ce6ca412](https://gitlab.com/to-be-continuous/dbt/commit/ce6ca4124e44ff25d7dba0aad8ba323e50053927))