Add frozen_string_literal to spec/lib

spec/lib/after_commit_queue_spec.rb

spec/lib/api/api_spec.rb

spec/lib/api/helpers/custom_validators_spec.rb

spec/lib/api/helpers/pagination_spec.rb

spec/lib/api/helpers/related_resources_helpers_spec.rb

spec/lib/api/helpers/version_spec.rb

spec/lib/api/helpers_spec.rb

spec/lib/backup/files_spec.rb

spec/lib/backup/manager_spec.rb

spec/lib/backup/repository_spec.rb

spec/lib/backup/uploads_spec.rb

spec/lib/banzai/color_parser_spec.rb

spec/lib/banzai/commit_renderer_spec.rb

spec/lib/banzai/cross_project_reference_spec.rb

spec/lib/banzai/filter/absolute_link_filter_spec.rb

spec/lib/banzai/filter/abstract_reference_filter_spec.rb

...ib/banzai/filter/ascii_doc_post_processing_filter_spec.rb

spec/lib/banzai/filter/autolink_filter_spec.rb

spec/lib/banzai/filter/blockquote_fence_filter_spec.rb

spec/lib/banzai/filter/color_filter_spec.rb