chore(deps): Bump github.com/cosmos/iavl from 0.19.4 to 0.20.1 #4290

Job	Run time
cleanup-runs	6s
install-tparse	11s
build (amd64, gcc)	53s
build (arm64, aarch64-linux-gnu-gcc, g++-aarch64-linux-gnu)	1m 10s
split-test-files	12s
test-cosmovisor	1m 33s
tests (00)	1m 34s
test-race (00)	1m 52s
tests (01)	1m 55s
test-race (01)	2m 6s
tests (02)	1m 12s
test-race (02)	1m 19s
tests (03)	1m 15s
test-race (03)	1m 8s
upload-coverage-report	0s
	16m 26s

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