bump actions/setup-go v4 #191

Job	Run time
Coverage	35s
Test in i386 (ubuntu-latest, 1.19)	14s
Test with -race (ubuntu-latest, 1.19)	20s
ycat	26s
Test in i386 (ubuntu-latest, 1.20)	24s
Test with -race (ubuntu-latest, 1.20)	23s
Test in i386 (ubuntu-latest, 1.21)	30s
Test with -race (ubuntu-latest, 1.21)	34s
Test in i386 (windows-latest, 1.19)	1m 59s
Test with -race (macos-latest, 1.19)	28s
Test in i386 (windows-latest, 1.20)	1m 51s
Test with -race (macos-latest, 1.20)	42s
Test in i386 (windows-latest, 1.21)	1m 54s
Test with -race (macos-latest, 1.21)	52s
Test with -race (windows-latest, 1.19)	4m 22s
Test with -race (windows-latest, 1.20)	1m 25s
Test with -race (windows-latest, 1.21)	2m 10s
	19m 9s

Provide feedback