Test

Bump ruby/setup-ruby from 1.319.0 to 1.321.0 #3104

Job	Run time
ruby-versions / Generate Ruby versions	5s
prism-version-test (1.6.0)	49s
prism-version-test (1.7.0)	52s
prism-version-test (head)	31s
test (3.4, windows-latest)	2m 42s
test (3.4, ubuntu-latest)	34s
test (3.3, ubuntu-latest)	44s
test (3.2, ubuntu-latest)	46s
test (4.0, macos-latest)	39s
test (head, macos-latest)	42s
test (mswin, windows-latest)	2m 36s
test (head, ubuntu-latest)	41s
test (3.2, windows-latest)	3m 4s
test (head, windows-latest)	2m 30s
test (3.3, windows-latest)	2m 58s
test (3.3, macos-latest)	42s
test (4.0, windows-latest)	2m 46s
test (truffleruby, ubuntu-latest)	1m 45s
test (4.0, ubuntu-latest)	53s
test (truffleruby, macos-latest)	2m 19s
test (3.4, macos-latest)	34s
test (3.2, macos-latest)	33s
	29m 45s

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