Update to 4.0.1 in CI #2304

Job	Run time
RuboCop	45s
specs (windows, 3.2.8)	4m 1s
specs (ubuntu, 4.0.1)	1m 34s
specs (windows, 4.0.1)	3m 18s
specs (ubuntu, 3.3.10)	1m 29s
specs (macos, 3.2.9)	1m 57s
specs (ubuntu, 3.4.8)	1m 36s
specs (macos, 4.0.1)	1m 28s
specs (macos, 3.4.8)	1m 37s
specs (windows, 3.4.8)	3m 7s
specs (windows, 3.3.10)	3m 25s
specs (ubuntu, 3.2.9)	1m 30s
specs (ubuntu, 4.0.1, --parser=parse.y)	1m 33s
specs (ubuntu, 4.0.1, --repeat 2)	2m 17s
specs (macos, 3.3.10)	2m 18s
specs (ubuntu, 4.0.1, --enable-frozen-string-literal)	1m 30s
	33m 25s

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