Backport: deps: migrate mapstructure to go-viper (#22581)#22780

LakshmiNarayananDesikan merged 1 commit intorelease/1.21.xhashicorp/consul:release/1.21.xfrom

backport/presently-powerful-wallaby/deps/update-mapstructurehashicorp/consul:backport/presently-powerful-wallaby/deps/update-mapstructureCopy head branch name to clipboard