Upgrade `gitlab-styles` to 12.0.1

.rubocop_todo/cop/gem_fetcher.yml

.rubocop_todo/graphql/extract_type.yml

.rubocop_todo/graphql/field_definitions.yml

.rubocop_todo/graphql/field_method.yml

.rubocop_todo/graphql/graphql_name.yml

.rubocop_todo/graphql/ordered_fields.yml

.rubocop_todo/graphql/unnecessary_field_alias.yml

.rubocop_todo/layout/class_structure.yml

.rubocop_todo/layout/extra_spacing.yml

.rubocop_todo/layout/line_break_after_final_mixin.yml

...todo/layout/line_end_string_concatenation_indentation.yml

.rubocop_todo/lint/redundant_safe_navigation.yml

.rubocop_todo/lint/self_assignment.yml

.rubocop_todo/lint/symbol_conversion.yml

.rubocop_todo/performance/map_compact.yml

.rubocop_todo/performance/string_identifier_argument.yml

.rubocop_todo/performance/string_include.yml

.rubocop_todo/rails/pluck.yml

.rubocop_todo/rspec/example_wording.yml

.rubocop_todo/rspec/factory_bot/excessive_create_list.yml