Bump html-pipeline to 2.8.4
In 2.8.3, it was possible to modify a constant without knowing it, which led to a major performance regression (https://gitlab.com/gitlab-org/gitlab-ce/issues/49409). Now attempting to modify the HTML::Pipeline::SanitizationFilter.WHITELIST will result in "can't modify frozen Hash". See https://github.com/jch/html-pipeline/pull/299.
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