Memoize the result of the module lookup #622

Job	Run time
ruby-versions / Generate Ruby versions	3s
test (3.0, ubuntu-latest)	35s
test (3.0, macos-latest)	24s
test (3.0, windows-latest)	1m 25s
test (3.1, ubuntu-latest)	17s
test (3.1, macos-latest)	28s
test (3.1, windows-latest)	1m 26s
test (3.2, ubuntu-latest)	26s
test (3.2, macos-latest)	52s
test (3.2, windows-latest)	1m 56s
test (3.3, ubuntu-latest)	17s
test (3.3, macos-latest)	30s
test (3.3, windows-latest)	2m 7s
test (head, ubuntu-latest)	32s
test (head, macos-latest)	28s
test (head, windows-latest)	1m 8s
test (jruby, ubuntu-latest)	1m 17s
test (jruby, macos-latest)	1m 51s
test (jruby-head, ubuntu-latest)	1m 31s
test (jruby-head, macos-latest)	1m 47s
test (ubuntu-latest, truffleruby-head)	1m 58s
test (macos-latest, truffleruby-head)	2m 37s
	23m 55s

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