chore(release): 2.9.0 [skip ci]

# [2.9.0](v2.8.1...v2.9.0) (2025-06-26)

### Continuous Integration

* update `pre-commit` configuration inc. for pre-commit.ci [skip ci] ([9f83975](9f83975))
* **kitchen+gitlab:** update for new pre-salted images [skip ci] ([2df772e](2df772e))
* **vagrant:** use `linked_clone` at all times (inc. CI) [skip ci] ([6f2b7b1](6f2b7b1))

### Features

* **opensuse:** optional openSUSE devel repository ([094bde5](094bde5))

### Tests

* **system.rb:** add support for `mac_os_x` [skip ci] ([8222541](8222541))

Author: semantic-release-bot