Update hamlit to 2.8.8 to fix Ruby 2.5 issue
What does this MR do?
Solves problem with ActionView::Template::Error (uninitialized constant ActionView::CompiledTemplates::EXPR_ARG) when using Ruby 2.5.
The change was figured out by looking at https://gitlab.com/gitlab-org/gitlab-ce/issues/42045#note_73010232.
Does this MR meet the acceptance criteria?
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Changelog entry added, if necessary - Conform by the code review guidelines
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Has been reviewed by a Backend maintainer
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