Bump haml-rails from 1.0.0 to 2.0.0

Bumps [haml-rails](https://github.com/indirect/haml-rails) from 1.0.0 to 2.0.0.
- [Release notes](https://github.com/indirect/haml-rails/releases)
- [Commits](https://github.com/indirect/haml-rails/compare/v1.0.0...v2.0.0)

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