refactor: update to x/tx v0.2.0

[facundomedica]

Description

Follow up to #14787

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[julienrbrt]

A follow-up needs to bump the SDK pseudo version used in confix: https://github.com/cosmos/cosmos-sdk/actions/runs/4166926093/jobs/7211885803
nvm, it was about the issue in the SDK that is fixed here.