Update minitest to help tests on ruby head run. #11

Job	Run time
test-isolated	21s
test-yjit (ubuntu, 3.1)	9s
test (ubuntu, 2.7)	25s
test-yjit (ubuntu, 3.2)	6s
test (ubuntu, 3.0)	15s
test-yjit (ubuntu, 3.3)	6s
test (ubuntu, 3.1)	11s
test-yjit (ubuntu, head)	13s
test (ubuntu, 3.2)	9s
test-yjit (macos, 3.1)	17s
test (ubuntu, 3.3)	9s
test-yjit (macos, 3.2)	16s
test (ubuntu, head)	14s
test-yjit (macos, 3.3)	15s
test (ubuntu, jruby)	52s
test-yjit (macos, head)	18s
test (ubuntu, jruby-head)	40s
test (ubuntu, truffleruby)	34s
test (ubuntu, truffleruby-head)	33s
test (macos, 3.0)	15s
test (windows, 3.0)	1m 29s
finish	3s
	7m 50s

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