Update heroku/buildpacks-ruby to v2.0.1 #464

Job	Run time
create (buildpacks-20)	1m 37s
create (builder-classic-22)	1m 5s
create (builder-22)	1m 5s
test-examples (builder-22, java-function)	1m 2s
test-examples (builder-22, javascript-function)	1m 2s
test-examples (builder-22, python-function)	1m 1s
test-examples (builder-22, typescript-function)	1m 27s
test-guides (buildpacks-20, go)	1m 34s
test-guides (buildpacks-20, gradle)	2m 44s
test-guides (buildpacks-20, java)	1m 35s
test-guides (buildpacks-20, node-js)	1m 16s
test-guides (buildpacks-20, php)	1m 7s
test-guides (buildpacks-20, python)	1m 45s
test-guides (buildpacks-20, ruby)	2m 51s
test-guides (buildpacks-20, scala)	2m 25s
test-guides (buildpacks-20, typescript)	1m 25s
test-guides (builder-classic-22, go)	1m 29s
test-guides (builder-classic-22, gradle)	2m 34s
test-guides (builder-classic-22, java)	1m 14s
test-guides (builder-classic-22, node-js)	1m 1s
test-guides (builder-classic-22, php)	1m 52s
test-guides (builder-classic-22, python)	1m 21s
test-guides (builder-classic-22, ruby)	3m 19s
test-guides (builder-classic-22, scala)	2m 11s
test-guides (builder-classic-22, typescript)	1m 4s
test-guides (builder-22, go)	1m 28s
test-guides (builder-22, java)	1m 26s
test-guides (builder-22, node-js)	1m 9s
test-guides (builder-22, php)	1m 30s
test-guides (builder-22, python)	1m 4s
test-guides (builder-22, ruby)	3m 29s
test-guides (builder-22, scala)	2m 16s
test-guides (builder-22, typescript)	1m 3s
test-guides (builder-classic-22, clojure)	1m 44s
publish	0s
	56m 15s

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