chore(release): 9.1.1 [skip ci]

## [9.1.1](https://gitlab.com/to-be-continuous/python/compare/9.1.0...9.1.1) (2026-01-06)

### Bug Fixes

* **bash mode:** unmask errors in shell pipelines with 'set -o pipefail' ([fd610ab3](https://gitlab.com/to-be-continuous/python/commit/fd610ab366955db0dc89036d236f5d835305b000))