release: update chart version to 1.2 #1191

Job	Run time
pr-test (one-chain-custom-scripts.yaml)	3m 55s
pr-test (one-chain.yaml)	3m 52s
pr-test (one-custom-chain.yaml)	4m 23s
pr-test (multi-validator.yaml)	3m 46s
pr-test (simapp.yaml)	3m 17s
pr-test (one-chain-starship-faucet.yaml)	3m 8s
pr-test (multi-validator-starship-faucet.yaml)	6m 57s
pr-test (one-chain-cometmock.yaml)	2m 57s
pr-test (one-cosmoshub-starship-faucet.yaml)	3m 22s
	35m 37s

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