chore: bump tendermint to 0.34.21 and iavl to 0.19.1

[julienrbrt]

Description

bump tendermint to 0.34.21 and iavl to 0.19.1

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Author Checklist

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I have...

• included the correct type prefix in the PR title
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• targeted the correct branch (see PR Targeting)
• provided a link to the relevant issue or specification
• followed the guidelines for building modules
• included the necessary unit and integration tests
• added a changelog entry to CHANGELOG.md
• included comments for documenting Go code
• updated the relevant documentation or specification
• reviewed "Files changed" and left comments if necessary
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Reviewers Checklist

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• confirmed the correct type prefix in the PR title
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• confirmed all author checklist items have been addressed
• reviewed state machine logic
• reviewed API design and naming
• reviewed documentation is accurate
• reviewed tests and test coverage
• manually tested (if applicable)