feat(go): bump go 1.20 to 1.21 #2560

Job	Run time
build (1.21.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	8s
build (1.21.x, amd64, linux, ./pkg/amino/cmd/goscan)	7s
build (1.21.x, amd64, linux, ./pkg/autofile/cmd)	12s
build (1.21.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	11s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/aminoscan)	11s
build (1.22.x, amd64, linux, ./pkg/amino/cmd/goscan)	5s
build (1.22.x, amd64, linux, ./pkg/autofile/cmd)	15s
test (1.21.x, _test.flappy)	22s
build (1.22.x, amd64, linux, ./pkg/iavl/cmd/iaviewer)	12s
test (1.21.x, _test.pkg.amino)	1m 34s
test (1.21.x, _test.pkg.bft)	2m 28s
test (1.21.x, _test.pkg.others)	2m 49s
test (1.22.x, _test.flappy)	28s
test (1.22.x, _test.pkg.amino)	1m 29s
test (1.22.x, _test.pkg.bft)	21m 14s
test (1.22.x, _test.pkg.others)	2m 33s
upload-coverage	0s
	34m 18s

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