textproc/ruby-yard: update to 0.9.27

0.9.27 (2021-11-29)

* Add support for Ruby 3.0 endless method definitions. (#1376, #1381)
* Add existence check for README file (#1367)
* Support module_function decorator (#1365)
* Add CommonMarker markup support (-m commonmarker) (#1157, #1388)
* Fix nested array parsing (#1389)
* Add WEBrick as a runtime dependency for Ruby 3.0 support (#1400)
* Support fail_on_warning option in yard stats command (#1392)
* Better integration with Sorbet (#1401)
* Handle include mixins on complex paths (#1386)
* Fix @!scope maintaining state in lone comment blocks (#1411)
* Remove support for Travis CI

(taca)