Test

Fix typo in CONTRIBUTING.md #693

Job	Run time
ruby-versions / Generate Ruby versions	2s
test (3.1, ubuntu-latest)	30s
test (3.1, macos-latest)	32s
test (3.1, windows-latest)	2m 22s
test (3.2, ubuntu-latest)	20s
test (3.2, macos-latest)	22s
test (3.2, windows-latest)	2m 29s
test (3.3, ubuntu-latest)	19s
test (3.3, macos-latest)	21s
test (3.3, windows-latest)	2m 54s
test (head, ubuntu-latest)	30s
test (head, macos-latest)	20s
test (head, windows-latest)	2m 6s
test (jruby, ubuntu-latest)	1m 41s
test (jruby, macos-latest)	1m 23s
test (jruby-head, ubuntu-latest)	1m 47s
test (jruby-head, macos-latest)	1m 30s
test (truffleruby, ubuntu-latest)	1m 33s
test (truffleruby, macos-latest)	1m 30s
test (truffleruby-head, ubuntu-latest)	2m 18s
test (truffleruby-head, macos-latest)	1m 25s
	26m 14s

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