Update ruby to version v260 #881

Job	Run time
build.20-true	27m 18s
build.22-true	30m 27s
build.20-false	7m 45s
build.22-false	7m 13s
unit.heroku-20.buildpack-clojure	6m 21s
unit.heroku-22.buildpack-clojure	5m 21s
unit.heroku-20.buildpack-go	6m 36s
unit.heroku-22.buildpack-go	3m 56s
unit.heroku-20.buildpack-gradle	5m 12s
unit.heroku-22.buildpack-gradle	4m 51s
unit.heroku-20.buildpack-java	4m 47s
unit.heroku-22.buildpack-java	4m 1s
unit.heroku-20.buildpack-multi	6m 55s
unit.heroku-22.buildpack-multi	4m 7s
unit.heroku-20.buildpack-nodejs	4m 16s
unit.heroku-22.buildpack-nodejs	3m 59s
unit.heroku-20.buildpack-null	4m 15s
unit.heroku-22.buildpack-null	5m 6s
unit.heroku-20.buildpack-php	4m 44s
unit.heroku-22.buildpack-php	4m 36s
unit.heroku-20.buildpack-play	6m 51s
unit.heroku-22.buildpack-play	5m 48s
unit.heroku-20.buildpack-python	4m 39s
unit.heroku-22.buildpack-python	4m 9s
unit.heroku-20.buildpack-ruby	4m 55s
unit.heroku-22.buildpack-ruby	4m 7s
unit.heroku-20.buildpack-scala	10m 29s
unit.heroku-22.buildpack-scala	10m 43s
unit.heroku-20.buildpack-static	5m 56s
unit.heroku-22.buildpack-static	4m 38s
	3h 34m 1s

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