chore(deps): bump rack from 3.0.8 to 3.0.9 in /buildpacks/buildpack-multi/tests/multi #980

Job	Run time
build.20-true	20m 14s
build.22-true	18m 30s
build.20-false	5m 37s
build.22-false	4m 31s
unit.heroku-20.buildpack-clojure	3m 58s
unit.heroku-22.buildpack-clojure	4m 13s
unit.heroku-20.buildpack-go	3m 35s
unit.heroku-22.buildpack-go	3m 35s
unit.heroku-20.buildpack-gradle	3m 25s
unit.heroku-22.buildpack-gradle	2m 59s
unit.heroku-20.buildpack-java	4m 13s
unit.heroku-22.buildpack-java	3m 45s
unit.heroku-20.buildpack-multi	3m 58s
unit.heroku-22.buildpack-multi	3m 25s
unit.heroku-20.buildpack-nodejs	3m 48s
unit.heroku-22.buildpack-nodejs	3m 6s
unit.heroku-20.buildpack-null	3m 17s
unit.heroku-22.buildpack-null	3m 22s
unit.heroku-20.buildpack-php	3m 34s
unit.heroku-22.buildpack-php	2m 41s
unit.heroku-20.buildpack-play	4m 17s
unit.heroku-22.buildpack-play	4m 45s
unit.heroku-20.buildpack-python	3m 52s
unit.heroku-22.buildpack-python	3m 43s
unit.heroku-20.buildpack-ruby	4m 49s
unit.heroku-22.buildpack-ruby	3m 55s
unit.heroku-20.buildpack-scala	8m 26s
unit.heroku-22.buildpack-scala	7m 35s
unit.heroku-20.buildpack-static	4m 23s
unit.heroku-22.buildpack-static	3m 18s
	2h 34m 49s

Provide feedback