Update haml_lint from 0.34.0 to 0.36.0

What does this MR do?

Updates haml_lint from 0.34.0 to 0.36.0, which is used in tests. While --parallel comes to be supported in this latest version, that looks only in CLI mode, not in the Rake task.

0.36.0
- #322 Add support for --parallel flag to run linters in parallel
- #326 Relax haml gem version constraint to allow 5.2.x
0.35.0
- #318 Fail HAML-Lint run when RuboCop exits unsuccessfully
- #320 Add support for Ruby 2.7
0.34.2
- Update ignored cops to support cop renames introduced by RuboCop 0.79.0
0.34.1
- Update ignored cops to support cop renames introduced by RuboCop 0.77.0

Does this MR meet the acceptance criteria?

Conformity

• Changelog entry
• Code review guidelines
• Style guides
• Separation of EE specific content