Prevent circular reference error in Banzai

lib/banzai/cross_project_reference.rb

lib/banzai/filter.rb

lib/banzai/filter/abstract_reference_filter.rb

lib/banzai/filter/autolink_filter.rb

lib/banzai/filter/commit_range_reference_filter.rb

lib/banzai/filter/commit_reference_filter.rb

lib/banzai/filter/emoji_filter.rb

lib/banzai/filter/external_issue_reference_filter.rb

lib/banzai/filter/external_link_filter.rb

lib/banzai/filter/issue_reference_filter.rb

lib/banzai/filter/label_reference_filter.rb

lib/banzai/filter/markdown_filter.rb

lib/banzai/filter/merge_request_reference_filter.rb

lib/banzai/filter/redactor_filter.rb

lib/banzai/filter/reference_filter.rb

lib/banzai/filter/reference_gatherer_filter.rb

lib/banzai/filter/relative_link_filter.rb

lib/banzai/filter/sanitization_filter.rb

lib/banzai/filter/snippet_reference_filter.rb

lib/banzai/filter/syntax_highlight_filter.rb