chore(release): 3.1.0 [skip ci]

# [3.1.0](https://gitlab.com/to-be-continuous/helmfile/compare/3.0.3...3.1.0) (2023-12-8)

### Features

* use centralized service images (gitlab.com) ([c97e799c](https://gitlab.com/to-be-continuous/helmfile/commit/c97e799c042f0b6a3eec999e27ca2ae49f23eb8c))