Bump haml_lint from 0.30.0 to 0.31.0

Bumps [haml_lint](https://github.com/sds/haml-lint) from 0.30.0 to 0.31.0.
- [Release notes](https://github.com/sds/haml-lint/releases)
- [Changelog](https://github.com/sds/haml-lint/blob/master/CHANGELOG.md)
- [Commits](https://github.com/sds/haml-lint/compare/v0.30.0...v0.31.0)

Signed-off-by: dependabot[bot] <support@dependabot.com>
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