Bump yiisoft/yii2-shell from 2.0.4 to 2.0.6

Bumps [yiisoft/yii2-shell](https://github.com/yiisoft/yii2-shell) from 2.0.4 to 2.0.6.
- [Release notes](https://github.com/yiisoft/yii2-shell/releases)
- [Changelog](https://github.com/yiisoft/yii2-shell/blob/master/CHANGELOG.md)
- [Commits](yiisoft/yii2-shell@2.0.4...2.0.6)

---
updated-dependencies:
- dependency-name: yiisoft/yii2-shell
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>