Remove stale code #50

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (2.5, ubuntu-latest)	28s
test (2.5, macos-latest)	56s
test (2.5, windows-latest)	2m 39s
test (2.6, ubuntu-latest)	32s
test (2.6, macos-latest)	1m 24s
test (2.6, windows-latest)	4m 18s
test (2.7, ubuntu-latest)	27s
test (2.7, macos-latest)	1m 9s
test (2.7, windows-latest)	2m 12s
test (3.0, ubuntu-latest)	15s
test (3.0, macos-latest)	25s
test (3.0, windows-latest)	1m 29s
test (3.1, ubuntu-latest)	21s
test (3.1, macos-latest)	35s
test (3.1, windows-latest)	2m 4s
test (3.2, ubuntu-latest)	47s
test (3.2, macos-latest)	33s
test (3.2, windows-latest)	3m 14s
test (head, ubuntu-latest)	25s
test (head, macos-latest)	44s
test (head, windows-latest)	1m 54s
test (jruby, ubuntu-latest)	4m 29s
test (jruby-head, ubuntu-latest)	4m 25s
test (truffleruby, ubuntu-latest)	2m 9s
test (truffleruby-head, ubuntu-latest)	2m 53s
	40m 50s

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